You can check to see what the current job log setting is for the backup. Select the job, then select modify. Go to backup options, then select the log tab. set it to "log all activity". With this seting the job log will have an entry for every file as it's backed up. I think when the job shows 99% the Arcserve database starts getting updated. It could be that your database file has a problem. Go into the database manager and see if there are any entries for the job that is showing incomplete.