A secure backup plan for shared business files needs more than a second copy: it should preserve multiple versions in separate locations, keep at least one copy isolated from everyday accounts, and prove through restore tests that staff can recover usable files. Start by identifying the files the business cannot afford to lose, then set recovery goals and assign clear ownership.
1. Inventory shared files and their dependencies
List the shared drives, team folders, file repositories, and collaboration locations the business relies on. For each, record its owner, business purpose, sensitivity, and the systems or accounts needed to access or restore it. Include important related systems such as identity and access services where file recovery depends on them.
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Prioritize the material whose loss would interrupt operations or cause serious harm. CISA recommends understanding critical data and system dependencies to guide restoration priorities after an incident: CISA’s LockBit advisory.
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Ask the owner of each important file set two questions: how much recent work could the business recreate, and how long could the files remain unavailable? Use the answers to define acceptable data loss and restoration time. Those goals determine how often copies need to be made, how long versions should be retained, and which files need the fastest recovery.
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There is no single backup interval or retention period that fits every business. A small team’s working documents and a business-critical operational repository may have very different consequences if their latest changes disappear. NIST’s guide for managed service providers and their customers addresses backup planning, service or product selection, and business disaster recovery.
3. Keep copies in separate failure domains
Use the 3-2-1 rule as a practical baseline, not as a compliance guarantee: keep three copies total (the primary and two backups), on two different media types, with one copy offsite. CISA/US-CERT describes the rule in its Data Backup Options guide.
Separation matters as much as copy count. If the same compromised account can alter or delete both the working files and their backups, those copies may fail together during an account takeover or ransomware incident. CISA recommends physically separate, segmented, secure locations and offline backups; see its LockBit advisory and StopRansomware Guide.
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A disconnected external drive or other removable storage can serve as one separate destination, but the device itself is not a complete backup plan. Keep it isolated when appropriate, protect it from loss or damage, and test that files can be restored from it. Remote storage or a managed backup service can also be part of the design; assess whether a failure or compromise of the production service or account could affect the backup too.
4. Protect backup data and administration
Encrypt backup copies and restrict who can administer, delete, or restore them. Keep recovery credentials and any necessary keys accessible to authorized responders during an incident, but do not expose them to the same account compromise that could affect production files. CISA specifically recommends offline, encrypted backups in its StopRansomware Guide.
For each destination, establish who controls access and deletion, how access is reviewed, and how an authorized restore is requested. Verify the actual protections and recovery process for the chosen platform or service; backup features and settings vary, and the general guidance does not establish specific controls for any one file-sharing product.
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5. Compare backup approaches against recovery needs
Physical media, remote or cloud storage, and managed backup services can be used separately or together. Compare them on the factors that determine whether the business can recover, rather than on the number of features advertised.
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| What to assess | Question to answer |
|---|---|
| Recovery speed and data loss | How quickly can priority files be restored, and how much recent work could be missing? |
| Isolation | Is any copy offline, isolated, or otherwise protected from compromised production credentials? |
| Administration and encryption | Who can access or delete backups, and how are the copies protected? |
| Versions and retention | Can the business recover earlier versions after accidental overwrites or malicious edits, and for how long are versions kept? |
| Restore assurance | Can staff test integrity and follow documented steps to restore files? |
| Offsite recovery | Is a copy available away from the business site, and does recovery depend on the same account or service as the production files? |
| Operational ownership | Will internal staff or a provider monitor copies, review access, and run restore tests? |
NIST’s MSP backup guide is relevant when evaluating whether to operate backup processes internally or buy a service or product.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. Test restoration, not just backup status
A successful backup-job message does not prove that a business can recover the right files. CISA recommends regularly testing backup availability and integrity in a disaster recovery scenario, and NIST advises organizations to “Carefully plan, implement and test a data backup and restoration strategy” in its ransomware tips.
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- Choose representative material. Include files and folders from priority locations, including examples with different access requirements or dependencies.
- Restore to a safe destination. Follow the documented process without overwriting live shared files.
- Check the result. Confirm files are readable and complete, and that their contents and versions match the recovery point the business intended to use.
- Exercise the handoff. Verify that the people and systems that need the restored material can access it, and record who performed the restore and any blockers.
- Fix and retest failures. Update permissions, instructions, or responsibilities where needed, then verify that the corrected process works.
NIST’s Data Integrity: Recovering from Ransomware and Other Destructive Events emphasizes trust in the accuracy of recovered data. Set a recurring test schedule appropriate to the business’s recovery goals and revisit it after significant changes; official guidance does not prescribe one universal interval.
7. Assign owners and maintain the plan
Name a responsible person or team for each recurring task so that critical steps do not depend on informal knowledge.
- Maintain the file inventory and identify business owners.
- Monitor backup completion and investigate failures.
- Review who can access, administer, and delete backup copies.
- Schedule and record restoration tests.
- Make recovery decisions during an incident and coordinate access to restored files.
Review the inventory, recovery goals, access, and restore procedure when collaboration tools, permissions, business-critical files, or retention needs change. NIST’s guide for MSPs and their customers stresses conducting, maintaining, and testing backups.
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