Backup Exec suddenly taking 12+ hours to complete what used to be a 3 hours backup

I have a client running Backup Exec 12.5 for SBS on SBS 2003. Up until 6 days ago, the backups were taking 3 hours to complete. Now, for no apparent reason, the backups take 12+ hours.

The backups are done to an internal DLT drive. No changes have been made to the server at all...

What could be causing this sudden increase in backup time?
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Chris MillardAsked:
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Chris MillardConnect With a Mentor Author Commented:
Ah - I think I may have found the issue. It appears that the data may be too big for one tape, and waits for another tape to be put in. Of course, the users come in the following day and swap tape, and then the backup finishes off!
If you have any faliure in the logs you should be able to trace it down.
If not check bacupexec remote agent services on the machines u are backing up.
If it is to a tape drive (HDD or DLT) I would first clean the drive head and see if it is a dirty head. Assuming you haven't suddenly put on the server a large number of files :)
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Chris MillardAuthor Commented:
There are no failure logs. The backup is completing successfully - it's just all of a sudden taking a long long time to complete.

The tape drive has been cleaned, and there is pretty much the same amount of data being backed up as there ever was.

I rebooted the server yesterday but that has made no difference.
Go to the backup log and compare the I/O rate to those which took 3 hours.

Sometimes open files may delay the "write" rate to the drive.
Chris MillardAuthor Commented:
As you can see from the screenshot, the Job Rate is around the 2,400 MB/min mark on all of the jobs
I'm betting a recent update caused it. I would my sure you have the latest tape drivers and disk/storage drivers. Also make sure to run LiveUpdate to get the latest updates for Backup Exec.
I agree with Connectex
Is probably a Backup Exec Update.
i would not update Backup Exec, while it is working.
Maybe reinstall the tape device drivers from Syamantec
Chris MillardAuthor Commented:
OK - The last Windows updates took place on 15th February 2011. This obviously isn't the cause, since the backups only started going "wrong" on 22nd February 2011.

I ran a LiveUpdate and installed 2 updates for Backup Exec.

The problem still exists
Chris MillardAuthor Commented:
As I eventualyl suspected. The backup was spanning 2 tapes. When the client came in in the morning, he was putting the next days tape in and the backup was completing.
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