back ups fail when they are at around 500-570 Mb- NO ERROR MSGS DISPLAYED

While using Arcserve, the backups fail in the region of 500-570 Mb. no error messages are displayed in all logs. Tried to back up less than 500 successfully without any issues. Operating System Server 2003 sbs.
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Go to the ARCserve Server Admin, Configuration, set the Job Engine to Debug and the Tape Engine to Detail. Then run the backup and again check the activity and tape logs.

I forget in version 9 what the name of the activity log is, either arcserve.log or brightstor.log. The Tape Engine log is tape log.
Try backing up data from a different drive.
What tape drive and tapes are being used?
Also it is a good idea to ck for updates because Windows Server 2003 Family is supported with ARCserve v9.0.1Build 2020 and above.
v9 updates can be found here:

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