Restore missing files after filesystem failure

[kapitainsky]

@jatwell

I did test using --force and then diff against a previous backup shows 1 changed file, but seems like my only option is to use --force every time I backup to catch changes with this one VeraCrypt file.

BTW this behaviour is configurable in Veracrypt - by default Veracrypt hides that file was used by restoring original mtime but it can be turned off.