Hi, I've read several posts in this forum about how incremental and differential backups work in TI and, unfortunately, I've just more confused What I'd intended to do is; - First Saturday in month perform full backup (Wk1) - Perform incremental backups Sun->Fri Wk1 - Perform differential backup Sat Wk2, the delete all incrementals - Perform incremental backups Sun->Fri Wk2 - Perform differential backup Sat Wk3, the delete all incrementals - etc. until we perform a new full backup first Saturday in the new month. Now my questions are; - my assumption is that when I schedule the differential backups, I select the full backup as the base file because I'm assuming that the way TI works, each differential will then include everything that's changed since that full backup at the start of the month. Is this correct? - secondly, and I'm less sure here, which file do I base my incremental backups on? I'd intended to also base them on the full backup because this will obviously work during Wk1, and I assumed that if I delete all the incrementals after the differential backup at the start of Wk2, then the incremental's being based on the full backup would still be right - ie. it would see no other incrementals in this backup set "chain" and so would include everything that's changed since the full backup (in other words I assumed that the first incremental immediately after the differential backup in Wk2 would be more or less the same as that differential backup, if you follow me) and then the rest of that week's incremental's would be small being only based on the changes since the previous incremental. Is this correct? Thanks for any help or insight anyone can give. David.