Choose a separate destination
A secondary internal drive is supported. An external drive gives better separation from a failure that affects the computer.
Let the drive readiness checks finish
Backup O’Clock checks the drive identity and responsiveness before allowing a run.
Use Drive Check for warnings
Drive Check shows connection, identity, responsiveness, and recorded Windows hardware-warning history.
Handle a changed drive letter
Wait for the registered drive to be identified. Backup O’Clock uses its identity rather than trusting only the letter.
Replace a drive intentionally
Use Settings → Maintenance → Replace registered drive only when moving the routine to another physical drive.