You will have to excuse me as I am new to Veritas. Basically my problem is that my daily diff job was running everyday every 2 hours and has ran fine up until last week, where it started to run what seems to be a full backup instead of diff. The only change that I can think of is we installed or started to use the advanced file open option. It seems that the archive bit is not getting reset. Any thoughts? We currently run Veritas on a Windows NT server.