Clarion NZ503 User Manual page 226

A status bar with the completeness percentage is shown while creating a backup is in
progress. The status bar changes to 'Completed' when the process is finished.
Restoring a backup
If you need to restore a backup, click the Restore button in the line that shows the name of
the backup.
A warning is displayed that if you choose to continue with restoring a backup, all changes
and updates will be lost that have been made after the backup date. Accept the warning only
if you are sure that no harm will be done to your important data.