Backups & restore points · Status and problems
What does "the safety check didn't pass" mean after a backup?
Short answer: The backup was saved but its follow-up check found a problem, so the newest version may be incomplete. Press Back up now to make a fresh one; earlier versions are unaffected.
It means the backup was written, but the check that runs afterwards found something wrong, so the newest version may be incomplete. The set shows Needs attention with "The backup was saved but its safety check didn't pass, so the newest version may be incomplete. Try Back up now again."
Press Back up now to make a fresh version, then let it check again. Earlier versions are unaffected. If the problem comes back each time, check the destination drive or account — for a drive, make sure it has free space and isn't being disconnected.