How to Back Up Photos and Documents Using the 3-2-1 Rule
Plan independent copies of important files, choose separate storage locations and test that a backup can actually be restored.
What is the problem?
Saving a second copy in another folder on the same computer may not protect against device failure or ransomware. Resilience requires independent storage and a tested way to restore data.
Step-by-step solution
Identify irreplaceable files first
Prioritize family photos, contracts, creative drafts and other material that cannot easily be downloaded again. Separate these from temporary files.
Use independent media and locations
CISA describes the 3-2-1 approach: three copies including the original, two different storage media, and one copy held off-site. A cloud service and disconnected external drive can provide distinct failure paths.
Plan a schedule and secure the copies
Decide how often new files are copied. Protect backup accounts, encrypt sensitive storage where possible, and disconnect removable media when it is not being used.
Practice restoring an actual file
Do not rely only on the presence of a filename. Restore a sample document, open it, and compare the contents with the original.
Alternative method
If cloud storage is not suitable, scheduled copies to removable storage are another option. A single local drive is still a single point of failure.
Known limitations
Cloud synchronization is not necessarily versioned backup: deletions may sync too. Account lockout and damaged removable media also require separate recovery planning.
Frequently asked questions
One drive can fail or be lost alongside the source computer. Consider an independent off-site copy and periodically test restoring your files.
Official primary sources
This article uses the official references below; consult them for the full guidance.
