Time Machine backups disappear

Hi - All my Time Machine backups (3 months worth) have disappeared from my LaCie Quadra Hard Drive after my last Time Machine backup. Either at the end or during the backup, I got an error message saying "Bitmap Mismatch". Any suggestions? Thanks, Bernie

Hamish Morrison wrote:
Well yes in principal I'm sure you're right about the drive capacity but I don't believe its a space, or lack thereof problem. I can't say that there was any unusually large backup that occurred that might cause it to wipe off the older backups.
I have done verification on both source & target drives. No issues found. Same with Techtool.
Yes, I also run Superduper every day to an external drive so at least all is not lost when TM fails. All drives are permanently attached & the Mac runs 24/7.
I also run the TM Buddy widget, but it only records info so far back and the challenge is being aware that you have lost the backup when you don't check it every day. By the time I notice the problem the info that might help diagnose the problem is gone!
I understand but it's really impossible to say now what might have caused it without seeing log info. file system errors are one possible reason but you say all drives check out fine. anything else would be unverifiable speculation at this point. once thing i've noticed in the past that any kind of problems with superduper backups can cause this. so if you ever get any issue with superduper check what's happening with TM.

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