I set up a backup job in Scheduled Tasks (6 diffs in between each full backup). The theory being that once a week I get a full backup, and a differential each day. I set my Backup Location to limit it to 8 files. The problem is that after the initial full backup (no backups in backup location yet) sometimes TI 10 will create only 3 diffs or maybe 5 diffs before doing a full backup again. This seems to be based on where the backup job was in the past. Deleting all the .tib files doesn't reset this either. The only way I've found to resolve this is to let the backup job play itself out into a 2nd round of backups and ignore the errant diff count on the first round. This is a bug that should be fixed. I've spent a bit of time and hair pulling over the past couple weeks not understanding why TI was ignoring my Scheduled Task differential parameters and Backup Location limits.