The reliable pattern is simple: connect a compatible USB external drive, use the backup tool built into your NAS or a repository tool such as restic on a Linux mini PC, schedule the job, and prove that files can be restored. A single disk beside the server is not a complete disaster plan, so add another copy and keep one copy away from the server when the data matters.
The exact procedure depends on whether the host runs Synology DSM, QNAP QTS/QuTS hero, or a general Linux/Unix operating system. Do not mix the menu paths between platforms.
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Choose the backup workflow before you plug in a drive
First identify the host and the kind of copy you need. A NAS vendor’s backup application can preserve packages, schedules, and version history. A Linux utility such as restic stores encrypted, deduplicated snapshots in a repository. Neither approach should be assumed to create a bootable image of the entire server.
| Host | Primary tool | Destination setup | Important behavior |
|---|---|---|---|
| Synology NAS running DSM 6.0 or later | Hyper Backup | Local Shared Folder or USB | Choose multi-version .hbk history or a directly readable single-version copy. |
| QNAP NAS | HBS 3 | Local NAS destination on the attached external device | Drive support depends on the exact NAS model; check QNAP’s compatibility list. |
| Linux or Unix mini PC | restic | A repository on a mounted external filesystem | Snapshots and checks are available, but scheduling must be supplied by systemd, cron, or another scheduler. |
Decide whether you need historical versions or merely the latest readable files. Version history helps recover from accidental deletion and ransomware-style changes, but it normally requires the backup application’s repository format. A directly readable folder is convenient when you need to plug the disk into another computer, but it generally does not preserve older states.
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Prepare the external drive and source data
Confirm compatibility and capacity
The substantiated hardware category for this job is a USB external hard drive. There is no universal model, capacity, interface, or brand that works with every NAS. QNAP explicitly requires checking compatibility for the particular NAS model. For a mini PC, verify that the USB port and power supply can operate the drive, especially when using a bus-powered portable unit.
Estimate capacity from the current data set, expected growth, and retention. A drive that barely fits today’s files leaves no room for snapshots, metadata, or future growth. The vendor material does not establish a universal sizing formula, so base the estimate on your own measured usage and the number of versions you intend to keep.
Check the mount and format
Connect the drive directly to the server rather than through an unpowered hub when possible. Confirm that the operating system reports the volume as mounted before creating a job. A new Synology external drive may need to be formatted in DSM before Hyper Backup can use it. Formatting erases existing contents, so copy anything important elsewhere first.
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Choose what is actually supported
List the folders that contain irreplaceable documents, photos, media, virtual-machine data, and application data. Then check whether the selected tool can include package data, system configuration, permissions, and metadata. Synology’s documented Hyper Backup tasks can include folders and packages, with system-configuration coverage depending on the task and DSM release. A restic file backup covers selected paths; it is not automatically a bare-metal image.
For databases and other actively changing applications, use the application’s own export or briefly pause writes when consistency matters. The workflow here does not verify commands for any particular home-server application, so consult that application’s documentation rather than assuming that copying a live data directory is sufficient.
Back up a Synology NAS with Hyper Backup
Synology documents the local USB workflow for DSM 6.0 and later. Menu names and available options can vary by model and DSM version; the following path follows the documented labels.
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Create the local USB task
- Attach the external drive and confirm that DSM recognizes it. Format it in DSM if the device is new and the system requests that step.
- Open Hyper Backup.
- Choose Data backup and create a Folders and Packages task.
- For the destination type, select Local Shared Folder or USB.
- Select the attached USB volume and the destination folder.
- Select the shared folders, packages, and any supported configuration items you need.
- Set the schedule, notification options, and retention/version policy.
- Save the task and run it once manually so you can inspect the result before relying on the schedule.
Synology’s local USB instructions were updated August 10, 2026 and apply to DSM 6.0 and later. If a label is missing, check the task type, DSM release, and model-specific package support instead of substituting a menu from another platform.
Multi-version mode: history in an .hbk repository
Multiple-version Hyper Backup stores the backup in .hbk form. It can retain historical states and offers encryption and compression options. The result is not an ordinary folder tree that every file manager can browse. Use Hyper Backup’s tools to browse versions or restore selected data.
This mode is appropriate when recovering from deleted or overwritten files is more important than opening the disk and dragging files out. Keep the encryption password or key separately from the drive; an encrypted repository without its credential cannot be recovered through the normal workflow.
Single-version mode: ordinary folders, no history
Single-version mode writes the latest data in the original file and folder structure. You can read the files directly from the external disk, which is useful for quick retrieval or moving data to another system. The trade-off is that earlier backup contents are overwritten. Synology’s documented single-version behavior also omits encryption and compression options available to the multi-version task.
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Check the first run and perform a restore
When the task finishes, inspect the destination and the Hyper Backup task log. In multi-version mode, open the repository with Hyper Backup’s browse or restore function and retrieve a small sample to a temporary location. In single-version mode, open the destination folder directly and compare several files, including a large file and a recently changed file. A green status indicator is not a substitute for opening recovered data.
Back up a QNAP NAS with HBS 3
QNAP’s HBS procedure uses an external storage device and a backup job. The exact screens can differ with QTS or QuTS hero versions and NAS models.
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Create and schedule the job
- Connect the external USB storage device.
- Open HBS 3.
- Create a new backup job.
- Select the source folders and any supported data you need to protect.
- Set the destination type to Local NAS.
- Choose a folder on the attached external device as the destination.
- Configure the optional schedule, retention, and notification settings.
- Save the job and start an initial run manually.
QNAP’s external-storage instructions were modified September 20, 2023. Its HBS quick-start guide, modified December 11, 2024, applies to HBS 3 version 17 or later. Before buying or formatting a drive, check QNAP’s compatibility list for your exact NAS model; support is not universal across the product line.
Verify a QNAP job
Review the HBS job history for completion and errors, then browse the destination folder from the NAS file manager. Restore representative files to a separate temporary folder rather than testing by overwriting the originals. Include files with different sizes and dates, and test any permissions or package data that your recovery plan depends on.
Back up a Linux or Unix mini PC with restic
Restic stores snapshots in a repository. The repository lives on the mounted external drive, while the source remains on the mini PC. This is a file-and-directory backup workflow, not a bootable system image. Rebuilding the operating system and reinstalling applications may still be necessary after a disk failure.
Initialize a repository
- Mount the external drive and identify a stable path, such as
/mnt/backup. - Create a repository directory, for example
/mnt/backup/restic-repo. - Initialize it with
restic -r /mnt/backup/restic-repo init. - When restic prompts for a repository password, create a strong one and store it in a password manager or another protected location separate from the drive.
The repository password is required to read or restore the snapshots. Do not leave the only copy of that password on the server being backed up.
Take the first snapshot
Back up the directories that contain your server’s important data. For example:
restic -r /mnt/backup/restic-repo backup /srv/data /etcReplace the paths with the locations you have audited. Including /etc can preserve configuration files, but it does not turn the result into a bootable image and does not guarantee that every service can be rebuilt without additional package and application steps.
After the command completes, list the snapshots:
restic -r /mnt/backup/restic-repo snapshotsConfirm that the expected timestamp, host, and paths are present. If the external volume was not mounted, stop and investigate before treating the run as a backup.
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Understand filesystem boundaries
Restic’s --one-file-system option prevents a backup from crossing into other mounted filesystems automatically. This matters when the external disk, a second internal disk, or a data volume is mounted below a directory included in your source path. The option may exclude that filesystem entirely.
Decide deliberately which filesystems belong in the backup. Specify each intended path or filesystem separately, then inspect the resulting snapshot. Do not assume that backing up / includes every mounted data volume.
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Schedule restic with systemd or cron
Restic does not include a built-in scheduler. Use a systemd timer, cron, or the scheduler supplied by your operating system. The scheduled action must run only after the external volume is mounted and must have access to the repository password.
A cron entry can invoke the same backup command used interactively, but production setups should also provide a non-interactive password method with permissions restricted to the backup service account. A systemd service and timer can express mount ordering and make failures visible in the journal. Whichever scheduler you choose, send output to a log or notification channel and review failures rather than allowing silent retries to accumulate.
Check and restore a restic repository
Run a repository check regularly:
restic -r /mnt/backup/restic-repo checkA check validates repository structure; it does not prove that every application can start from the restored files. Periodically restore representative files to a temporary directory:
restic -r /mnt/backup/restic-repo restore latest --target /tmp/restic-restore-testOpen the restored files and verify their contents. For a real recovery, select the appropriate snapshot rather than blindly choosing latest. Keep the temporary restore outside the source tree so it cannot overwrite live data.
Make the backup verifiable, not merely configured
Use a first-run checklist
- The host recognizes the external drive and reports the expected capacity.
- The selected source folders contain the data you intended to protect.
- The job completed without warnings about permissions, unavailable packages, or missing mounts.
- The destination contains new data at the expected time.
- A sample file can be opened after restoration.
- The next scheduled run occurs when the drive is connected and unlocked.
Test the failure cases
Disconnecting the drive before a scheduled run should produce an obvious failure, not a false success. Check logs after a missed run. For restic, make sure the repository path is not accidentally created on the mini PC’s internal disk when the USB volume is absent. For a NAS, verify that the task points to the intended USB volume and not a similarly named local share.
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Protect application consistency
A file-level snapshot can capture a database while it is mid-transaction. Use an application-specific dump, export, or maintenance window when the service requires a consistent state. Keep those exports in a directory included by the backup job and test restoring one, because a copied configuration file alone may not be enough to rebuild the service.
Choose retention, encryption, and connection habits
Retention and version history
Retention should match how far back you may need to recover. Keep enough versions to cover the interval in which an unnoticed deletion or corruption could be discovered. Hyper Backup exposes retained-version settings for scheduled tasks. Restic snapshots remain until you apply a retention policy; the exact policy should reflect your available capacity and recovery needs.
Encryption and keys
Hyper Backup multi-version tasks can use encryption. Restic repositories are protected by the repository password. Store every required password or key separately from the external disk, ideally in a secure password manager and an additional protected location. Without the credential, the encrypted data is not practically recoverable through the normal tools.
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A permanently attached drive enables unattended schedules. A drive disconnected and stored separately reduces exposure to incidents affecting the running server, but it cannot receive scheduled updates while disconnected and is not a substitute for multiple copies. If you rotate drives, label each one, record its last successful run, and reconnect it often enough to keep the intended recovery point current.
Use the 3-2-1 rule for disaster resilience
Synology and QNAP recommend a 3-2-1 approach: keep at least three copies of important data, on two different media, with one copy off-site. The USB drive beside the server is one additional copy, not the whole strategy. Theft, fire, power damage, malware, or a failed NAS and attached disk can remove both local copies at once.
RAID can improve availability when a disk fails, but Synology specifically cautions that RAID and a local copy do not prevent every form of data loss. Add a second medium and an off-site copy when the data cannot be recreated. The vendor material does not establish a particular remote service or a quantified benefit for disconnecting a disk, so choose an off-site method that you can maintain and periodically verify.
Troubleshoot common failures
The NAS does not show the drive
- Try a different USB port and a direct connection.
- Check the drive’s power requirement and cable.
- Confirm model compatibility, especially on QNAP.
- Look for a DSM prompt to format a new device; copy existing data elsewhere before formatting.
The job reports success but files are missing
- Review the selected source list; do not assume every share or package was included.
- Check whether permissions prevented reading particular paths.
- On a mini PC, verify mount points and whether
--one-file-systemexcluded another volume. - Inspect a snapshot or destination folder and perform a test restore.
Restic cannot open the repository
- Confirm that the external volume is mounted at the same path.
- Check the repository path and repository password.
- Ensure the scheduled service account can read the mount and repository.
- Run
restic snapshotsinteractively to distinguish a credential problem from a scheduler or mount problem.
There is not enough space
- Measure source growth and current repository or destination usage.
- Reduce retained versions only after deciding which recovery points remain necessary.
- Move older copies to another medium rather than deleting the only historical backup.
- Replace the drive with a compatible, larger one after checking the NAS model and connection limits.
A practical operating routine
- Once, inventory shares, applications, configuration, and mount points.
- Once, create the Hyper Backup, HBS 3, or restic job and run it manually.
- After the first run, restore several representative files.
- At each scheduled interval, review completion status and available capacity.
- Monthly or after major changes, run a repository check and a larger restore test.
- Periodically rotate or copy the backup to a different medium and update the off-site copy.
- Record the repository password, destination, retention policy, and recovery steps where the person performing recovery can find them.
This routine turns an external disk from a one-time copy into a recoverable backup system: the platform-specific tool captures the data, verification demonstrates that the copy is usable, and additional copies address failures that a single local drive cannot.
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