According to the help, the differential is based only on the prior full backup. Is that really true? Back when the archive bit got used to determine which files changed, full and incremental backups reset (cleared) this bit. That meant that differential backups were based on BOTH the full and incremental backups. The differential did not change the state of the archive bit but it still only backed up files that had it set. Well, that meant the archive bit got cleared for both full and incremental backups. So the differential would see only files that changed since the prior full or incremental backup, not just since the prior full backup only. The help says TI bases its differential on the prior full backup. Is that true? If a full backup is performed and several times thereafter there have been incremental backups, will the differential backup include all the files that changed and were included in those incrementals (versus how it worked before where differentials didn't include any files in either the full or incrementals)?