The Data in Backup ** incorrectly formatted

I have a re acurring problem with a Sql 2000 database, for some unknown reason the temp database explodes and fills up the disk, subsequently on the same partition the user database backup fails because there is no room left.
When this happens the Sql log says the following -
The backup data in 'F:\MSSQL\Backup\dbname' is incorrectly formatted. Backups cannot be appended, but existing backup sets may still be usable.
I have to copy the backup files affected to another location and then re run the backup for it to complete.
Are the old backup files still valid? is there a better way round this?
G_toddAsked:
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arbertCommented:
NO--don't ever rely on a backup when you get this error (usually you can restore it though).  Are you backing up the databases to the same drive????

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G_toddAuthor Commented:
Yes limitations of the hardware mean that the data and log files are on the same drive.
I also need to try and work out what is causing the Tempdb to explode..
arbertCommented:
I would startup profiler and monitory what is hitting the tempdb database--that will help you narrow that problem down.  Maybe a big select statement with a sort clause, and insert....into statement, any temp table creation (duh)...

Do you have a network drive that you can bakup to?

backup yourdatabasenamehere to disk='\\uncservername\path\backupname.BAK'


Brett
G_toddAuthor Commented:
Yes I've started backing up to another Sql server as a tempory solution. Profiling the tempdb is definatly the way forward, not sure how to best perform the trace but thats the next thing to work out.
Thanks for your comments.
arbertCommented:
Yep, just start up SQL SErver profiler (in the SQL Server program group).  There are a couple of existing trace templates, or you can create your own.
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