To take action : 15–30 min, plus copying time · Depending on your devices and accounts
If your PC dies tomorrow, what do you lose?
Prepare a copy you can actually restore.
PatchYourself · Last editorial revision : · Sources
Fictional example: an everyday situation
Noor’s drive fails. Her recent photos were synced, but a document folder existed only on the computer. She now prepares a backup and checks what it contains.
The problem
A failure, theft, deletion or ransomware attack can make files inaccessible. A backup is a copy kept so you can recover them.
Synchronization and backup are not always equivalent. A deletion may spread across synced devices. Check which versions and deleted files are retained, and for how long.
What to do now
Step 1: Choose important files
List photos, documents and projects that would be difficult to replace. Check files kept inside apps or online accounts too. Note what your backup solution actually includes.
Step 2: Set up a separate copy
On Windows, check backup and File History options available in your version. On Mac, Time Machine can back up to a suitable drive. A cloud service can complement a local copy, depending on its capacity and restore features.
Keep at least one copy separate from the main device. A permanently connected drive may also be reached by malware. A disconnected copy or storage with protected versions limits this risk.
Step 3: Check that copying finishes
The first backup may take a long time. Check its date, included folders, errors and available space. Service prices and storage allowances change: compare current offers before buying.
Step 4: Try a safe restore
Choose an unimportant file or create a test document. Back it up, then restore it to another folder without deleting the original. Open the restored copy and check its contents.
Keep encryption keys and recovery information somewhere accessible if your device disappears. A copy you cannot unlock will not help.
Go further
The 3-2-1 rule
A common guide is three copies, on two distinct media or systems, with one away from the primary location. You do not need to buy everything immediately: start with a separate copy and a restore test.
Versions matter
A file may be damaged before you notice. Multiple versions let you return to an earlier state. Check retention periods and test again after changing devices or backup solutions.
Sources and verification
References used for this revision. Menus and offers can change; consult the provider’s help for your version.