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Proton Drive CLI lets you run discrete uploads and downloads from a terminal, script, or scheduler on Windows, macOS, and Linux. A practical backup job authenticates once through Proton’s browser sign-in, uploads only the files that changed, records machine-readable output when useful, and runs at an interval you choose. It does not provide the Proton Drive applications’ always-running synchronization engine, so a cron or Task Scheduler entry is a repeatable backup action—not continuous two-way sync.
What Proton Drive CLI does—and what it does not do
The command-line interface is a lightweight way to perform Drive operations from scripts. Proton’s support documentation describes commands for listing Drive contents, uploading files, downloading folders, and sharing items. The launch announcement dated June 9, 2026, describes the CLI as scriptable and suitable for backup jobs and cron on Windows, macOS, and Linux.
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| Capability | Proton Drive CLI | Proton Drive applications |
|---|---|---|
| Operating model | Runs a requested operation and exits | Includes a full synchronization engine that runs in the background |
| Automation | Can be called by shell scripts, cron, or a Windows scheduled task | Designed for ongoing background synchronization |
| Machine-readable output | Supports --json for output that can be piped to other tools |
Primarily graphical workflows |
| Best fit | Scheduled snapshots, selective uploads, server-side jobs where the login environment is available | Continuous two-way access and synchronization on a personal computer |
A scheduled upload can make a new cloud copy every hour, night, or week. It will not notice and transfer changes between runs, resolve conflicts continuously, or behave like a mounted synchronized folder.
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Encryption and privacy boundaries
Proton says file contents, filenames, and folder names are encrypted with your private key before they leave the device. The CLI receives the same end-to-end encryption protection as the rest of Proton Drive. Encryption does not mean every piece of metadata is hidden: Proton identifies file size as an example of information that is not encrypted so server functions such as sorting can work. Do not interpret the feature as a guarantee that Proton sees no information at all.
Your authenticated session is stored by the operating system’s credential facility: Windows Credential Manager, macOS Keychain, or libsecret on Linux. The documented sign-in process opens a browser. The official material does not establish a dedicated headless-server flow or service-account mode, so a script should not be described as independent of an interactive login unless you have verified that behavior in your own environment.
Requirements and sensible backup design
Software and account prerequisites
- A Proton Drive account with enough available storage for the data you intend to retain.
- The CLI binary for your operating system, downloaded from Proton’s official distribution channel.
- A terminal account that can read the source files and write logs if you keep them.
- A browser available for the documented authentication flow.
- For scheduled jobs, a machine that is powered on and connected when the schedule runs.
On macOS and Linux, Proton says the downloaded binary needs executable permission. From the download directory, run:
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./proton-drive versionThe version command confirms that the binary can start. On Windows, use the downloaded executable’s actual filename from PowerShell or Command Prompt; the platform is supported, but the exact filename and invocation depend on the package you downloaded.
Use the 3-2-1 model as the target, not one cloud folder
CISA’s Data Backup Options guidance describes the 3-2-1 strategy: “3 – Keep 3 copies of any important file: 1 primary and 2 backups. 2 – Keep the files on 2 different media types to protect against different types of hazards. 1 – Store 1 copy offsite (e.g., outside your home or business facility).” A Proton Drive upload can be one offsite copy, but the CLI alone does not create three copies or two media types.
- Keep the working copy on your computer or server.
- Use Proton Drive as an encrypted offsite copy.
- Add a separate local medium, such as an external hard drive or portable SSD, if your risk assessment calls for another medium.
Decide what “backup” means before writing a schedule. The commands documented by Proton transfer files and folders; the reviewed material does not prescribe retention periods, version naming, immutable storage, or a built-in versioned-backup design for CLI scripts.
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Install and authenticate once
- Download the CLI package for Windows, macOS, or Linux and place it in a directory intended for command-line tools.
- Open a terminal in that directory. On macOS or Linux, grant execute permission with
chmod +x proton-drive. - Start the documented browser login flow:
./proton-drive auth login. On Windows, invoke the equivalent downloaded executable from your shell. - Complete authentication in the browser window that opens. Return to the terminal only after the sign-in flow reports success.
- Verify the installed build with
proton-drive version(or the platform-specific executable name). - Inspect the command tree and flags before automating:
proton-drive --help, followed by the relevant subcommand’s--help.
Do this interactively before creating a scheduled task. A scheduler may run without a visible desktop, while the documented login process is browser-based. If the session expires or the operating system credential store is unavailable to the scheduled account, the job can fail instead of prompting successfully.
Inspect commands before putting them in a script
CLI flags can change between builds, so treat the help output from your installed version as authoritative. Start with:
proton-drive --help
proton-drive filesystem --help
proton-drive filesystem upload --help
proton-drive filesystem download --helpProton documents --json for machine-friendly output. That output is useful when a wrapper needs to detect success, count items, or send a result to a log processor. Check the help text for where your installed version accepts the flag rather than assuming a global or subcommand position.
Run a cautious manual upload
Test with a small, disposable directory first. The documented example uploads files from a local reports directory into a Drive folder and skips conflicts:
proton-drive filesystem upload ./reports/* /my-files/Reports --conflict-strategy skipThe wildcard is expanded by your shell before the CLI receives it. Confirm that it matches the files you expect, that the destination path is correct, and that the account has sufficient space. The skip conflict strategy is a conservative starting point when the goal is to avoid replacing an existing remote item. Read proton-drive filesystem upload --help for the exact conflict choices and option syntax in your build.
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Download for a restoration test
A backup is useful only if you can recover from it. Proton’s documented download example copies a Drive folder to a local directory:
proton-drive filesystem download /my-files/Reports ./backupsRestore into a temporary directory first, not over the live working files. Open representative documents, compare expected filenames and folder structure, and record any permissions or application-specific behavior that your files require after download. The reviewed Proton material does not establish a dedicated integrity-verification command, so do not claim that a successful transfer automatically proves every byte has been validated by a separate checksum process.
Turn the upload into a repeatable script
A wrapper script centralizes paths, logging, and safety checks. This example intentionally uses the documented upload form and stops when a command returns an error:
#!/usr/bin/env bash
set -euo pipefail
CLI=/opt/proton-drive/proton-drive
SOURCE=/srv/reports
DEST=/my-files/Reports
LOG=/var/log/proton-drive-upload.log
printf '%s starting uploadn' "$(date -Is)" | tee -a "$LOG"
"$CLI" filesystem upload "$SOURCE"/* "$DEST" --conflict-strategy skip 2>&1 | tee -a "$LOG"
printf '%s upload command finishedn' "$(date -Is)" | tee -a "$LOG"Replace the paths with locations that the scheduled account can access. Before scheduling, run the script manually as that same account. Confirm that the source wildcard behaves correctly when the directory is empty; shell wildcard behavior differs, and an empty source should not accidentally be interpreted as a literal filename. If you need machine-readable records, add --json in the position specified by your installed command’s help output and adjust the logging pipeline to retain valid JSON.
Keep credentials out of the script. The CLI’s session is held in the operating system credential store, not in a password embedded in a shell file. Limit read permissions on the script and logs because filenames, paths, and operational details can still be sensitive even when file contents are encrypted in transit and at rest.
Schedule the script with cron on macOS or Linux
- Run the upload script interactively until it completes with the expected account and destination.
- Find its absolute path, for example
/usr/local/sbin/proton-drive-backup.sh, and make it executable withchmod +x /usr/local/sbin/proton-drive-backup.sh. - Open the crontab for the account that owns the authenticated session with
crontab -e. - Add a schedule such as
30 2 * * * /usr/local/sbin/proton-drive-backup.shfor a daily 02:30 run. - Redirect standard output and errors if your script does not already log them, for example
30 2 * * * /usr/local/sbin/proton-drive-backup.sh >> /var/log/proton-drive-cron.log 2>&1. - Trigger or wait for one run, then inspect the log, the cron service log, and the Drive destination.
Cron supplies a sparse environment. Use absolute paths for the binary, script, and important directories; do not rely on a graphical terminal’s current directory or shell initialization files. Avoid overlapping runs when an upload may take longer than the interval. A lock mechanism can help, but choose one supported by your operating system and test its failure behavior rather than assuming a scheduler will serialize jobs.
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- This USB drive provides plug and play simplicity with the included 18 inch USB 3.0 cable
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The browser-based authentication boundary remains important. Cron can repeat an already authenticated operation, but the official sources do not document a headless login or explain how every session-expiration case is handled. Treat reauthentication as an operational task and monitor for failures.
Schedule with Windows Task Scheduler
- First run the downloaded CLI manually in the same Windows user account that will own the task, complete browser authentication, and perform a small upload.
- Open Task Scheduler and choose Create Basic Task.
- Give the task a descriptive name such as “Proton Drive reports backup,” then choose a daily or weekly trigger appropriate for your recovery-point objective.
- Choose Start a program. In Program/script, enter the full path to the CLI or to a wrapper PowerShell script. Put arguments in the separate Add arguments field, following the syntax displayed by your installed
--helpoutput. - Set Start in to the directory containing the script or binary when relative paths are unavoidable; absolute paths are safer.
- Open the task’s properties and decide whether it should run only when that user is logged on. A task running under a different account may not see the original account’s Credential Manager entry.
- Use Run to perform a test, then inspect the task history, exit code, local logs, and Drive destination.
Do not store a Proton password in a batch file or task argument. If the task cannot access the authenticated credential store, fix the account context and sign-in state rather than placing secrets in plain text.
Use JSON output for monitoring
The CLI accepts --json for machine-friendly output that can be piped to another program. A useful monitoring pattern is to save the raw result, check the process exit status, and alert when the command fails or reports an unexpected result. Keep the parser tolerant of fields that may differ between versions, and validate the schema against your installed build’s help and sample output before depending on it in production.
Do not treat a successful process exit as proof that every intended source file was present. A robust wrapper records the source directory, destination, start and end times, exit status, and the result returned by the CLI. If your policy requires a count, compare the expected input set with the operation’s reported items without assuming that a JSON field name will remain unchanged forever.
Respect Proton’s fair-use guidance
Proton advises uploading or downloading only what has actually changed. Repeatedly reuploading identical files or rewriting an entire folder for a small change wastes transfer capacity and can create unnecessary traffic. The launch article says unusually high traffic may result in temporary throttling, but it gives no numeric threshold.
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- Use a conflict strategy that matches your intent;
skipavoids replacing existing remote items in the documented example. - Choose an interval that reflects how quickly the data changes and how much work one run can complete.
- Watch logs for throttling or repeated failures and allow a later run rather than launching many concurrent retries.
- Do not advertise a guaranteed transfer rate or a fixed request limit; Proton has not published one in the cited launch material.
CLI versus continuous synchronization
| Question | CLI answer | Application answer |
|---|---|---|
| Will a changed local file upload immediately? | Only when a scheduled or manually started operation includes it | The applications’ background synchronization engine is designed for ongoing changes |
| Can I integrate it with an existing workflow? | Yes; scripts and --json output support automation |
Usually through the application’s user interface and operating-system integration |
| Is it appropriate for a nightly backup? | Yes, provided authentication, paths, conflict behavior, and recovery are tested | It can provide continuous synchronization rather than a discrete nightly action |
| Does it replace a second backup medium? | No; one cloud destination is only one part of a 3-2-1 design | No; synchronization is not the same as independent backup copies |
Choose the CLI when you need explicit, bounded operations—for example, uploading a report directory after a batch job. Choose the application when your requirement is background two-way synchronization. Neither choice by itself defines retention, offsite diversity, or a tested restoration process.
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Troubleshoot common failures
The command is not executable
On macOS or Linux, confirm that you ran chmod +x proton-drive and that the terminal is in the directory containing the binary. Run ./proton-drive version with the relative path shown. On Windows, verify that the task or shell points to the actual executable filename.
Browser login does not complete
Run auth login interactively in the account that will execute the job. Check that a browser can open, then confirm that the session appears in the operating system credential store. A noninteractive service account may not have access to the user session that completed login; the official material does not confirm a separate headless authentication mode.
The scheduler reports success but no files arrive
Run the exact command manually as the scheduled account. Replace relative paths with absolute paths, print the expanded source directory, verify the Drive destination, and inspect the CLI exit status and logs. A graphical terminal’s environment is not automatically inherited by cron or Task Scheduler.
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That can be the intended result when the operation and conflict strategy avoid replacing existing items. Confirm the remote folder and the selected strategy rather than forcing a full rewrite. Proton’s fair-use guidance specifically discourages repeatedly transferring identical data.
Transfers are throttled or repeatedly fail
Reduce concurrency, stop overlapping schedules, and limit each run to files that changed. Proton says unusually high traffic may be temporarily throttled but does not publish a numeric threshold. Preserve error output and retry on the next planned run instead of creating an aggressive retry loop.
A restore is incomplete
Download into a clean temporary directory, verify that the source path and remote path are correct, and compare representative files. Check available local disk space and permissions. Because no dedicated integrity-verification command is established in the cited material, use your own documented validation procedure and record what it checks.
Operational checklist before relying on the job
- Authentication was completed in the same operating-system account that runs the schedule.
- The binary version and every flag were checked with the installed build’s
--helpoutput. - A small manual upload reached the intended Drive folder.
- The script uses absolute paths, records errors, and does not contain a password.
- The schedule was tested through the real scheduler, not only from an interactive shell.
- Overlapping runs and empty source directories have defined behavior.
- A temporary-folder download has been performed and the recovered files opened successfully.
- The cloud copy is documented as one component of a broader 3-2-1 plan.
- You know how you will notice an expired session, throttling, or a failed run.
What this setup can realistically provide
A carefully scheduled Proton Drive CLI command can create repeatable encrypted cloud copies while keeping the workflow under your control. It is strongest when the source set is well defined, each run transfers only changed data, logs are monitored, and restoration is practiced. It should not be presented as continuous synchronization, a guaranteed unattended server login, a complete retention system, or a substitute for another backup medium. Those boundaries let you use the CLI for what it is: a scriptable operation layer that complements, rather than replaces, the full Proton Drive applications and a broader backup strategy.
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