If the disk is damaged but the enclosure is OK, just replace the disk. I have done this just to upgrade capacity. I really like Seagate and Samsung drives (but that's my personal preference based on a limited sample and a lot of prejudice).
For not much more outlay (if any) you could set up an old PC as an AFFA box (SMEserver + AFFA contrib) and run scheduled backups. The contrib explains how to configure backups and how to restore a single file.
Good luck
Ian