I don't know what to really ask here but i will give as much detail as i can, i am sure you will have tons of follow up questions to get to a result.
I am running Symantec Backup 12.5 on Windows 2003 Server and have attached a tape backup. We run nightly Full backups, We have gone several weeks with successful backups and now it spits the tape out and requests another tape but never finishes. We have made no changes recently that would cause the tapes to run differently. the tapes are 200/400GB tapes and we backup approx. 200GB of data nightly. This job usually completes in about 10 hours and currently we cannot get the job to complete successfully. i never get an acual error message, it appears to backup successfully all the data it will just not finalize and finish the backup.
If any ideas or questions please let me know.