back-up problems

in the week ( one week exactly) preceding the change-over from Beta 1.6 to 1.7 my docs did not back up. Has anybody else had the same problem or know the reason for the glitch?

Which backup method are you referring to, snapshots or project backups (from the File menu)? What is the exact wording in any error messages you get, or if you do not get any messages, what are you doing to determine it has not worked?