>Sometimes a customer's data would get corrupted for the usual reasons - network crashes or maybe a bogus data conversion. They might have neglected to make regular backups or they might have been such heavy users that the loss of one day's data would be harmful. That was particularly likely because this data was entered by a customer while talking on the phone to a client without a hard copy being made during the phone conversation. When data was damaged, customers would send it to us for repair. If the corruption wasn't too extensive, and limited to the record pointers, we could fix it by looking for patterns in the errors and using the redundancy in the record pointers.

In addition to what Mark said

If you fear for data corruption why not go for a hardware based solution e.g.
use a RAID disks setup etc.

Arnon