Quick answer
The 3-2-1 rule means keeping three copies of important data, using two different storage types or independent media, with one copy away from the main location. A backup is useful only if you can restore it.
Understand the problem before changing anything
A laptop and a USB drive left in the same bag can disappear together. A synced folder can also pass an accidental deletion to another device. Plan for both equipment loss and mistakes by choosing independent copies with useful version history.
Step-by-step checks
Identify the files that matter
List documents, photos, accounts, projects and any application databases. Check folders outside Documents, including files stored on a second drive.
Keep a separate local backup
Use an external drive or a suitable backup destination. Choose a schedule based on how much work you could afford to lose, and check that jobs complete.
Add an off-site copy
Use a backup service or a securely stored drive elsewhere. Review retention, account recovery, encryption and storage limits before relying on it.
Protect backup independence
Keep at least one copy disconnected or otherwise protected from ordinary account mistakes. A second partition on the same disk does not protect against that disk failing.
Test a restore
Recover a recent file and an older version into a different folder. Open both in their normal applications, then record the test date.
What to avoid
Do not overwrite the only working copy while testing. A successful upload indicator does not prove that every folder is included or that older versions remain available.
How to verify the result
Your plan should name each destination, its schedule and a recovery method. Repeat the restore test after changing a backup app, account, drive or folder layout.
Verify that the saved copy can actually be restored
List the folders and application data that matter before judging a backup by its success message. Desktop files, email archives, project dependencies and a second drive may sit outside the default selection. Record the backup destination, account and date so you can identify the right copy during recovery.
Test restoration into a separate location rather than overwriting your working files. Choose a recent file, an older version and an example that depends on linked assets. Open the restored items in their normal applications and compare their contents. A folder listing or matching filename is not enough to establish a usable recovery copy.
Consider what happens if the original device, account or building is unavailable. Keep recovery information accessible through an appropriate secure route and avoid storing every copy beside the computer. Sync and backup can overlap, but check deletion recovery, version retention and account access instead of assuming they offer identical protection. Repeat the restore test after changing destinations, encryption, folder selections or backup software, and keep a short record of what was successfully tested.
Before you finish
- Folder coverage checked
- Destination and recovery access recorded
- Sample restored to a separate location
- Old and recent versions opened successfully
Common question
Does cloud sync count as a backup?
It can provide part of a plan, but check version retention and deletion recovery. A separate, restorable copy protects against problems that ordinary sync can reproduce.
Need help with the next step?
Tell RJ Computers the device model, exact symptom, checks already tried and whether important files are backed up. Confirm availability, assessment charges and the scope of work before arranging a visit.
Reference and version notes
Check the official instructions for your exact product version; menu names and available features can differ.
CISA: Data backup options