A client's 600 Mb database, running of FB 1.01, refuses to back up
with the error "cannot find back record version (291)."

Validation check produces no errors. Backing up with checksum,
garbage collection and limbo transactions switched off makes no
difference.

The table on which the back up seems to fail gives errors if I try
to empty it or drop it ("software consistency check").

Is there anything I can do? The client's tape backup stops the FB
service every night and backs up the database file, and I don't know
how far back the corruption goes.

I would be grateful for any help.

Roger Vellacott
Passfield Data Systems.