Differential Backup Strategy
Using this strategy, all files that have changed since the last full backup are backed up (the archive bit is used to determine this). The archive bit is not cleared during each backup.
Backing up data using this method gets progressively slower as the time between full backups increases. In theory, if every file selected for backup had changed since the last full backup, this backup method would take as long as a full backup. Restoring data from a differential backup is slower that doing so from a full backup, as a full backup must be restored first, then the most current differential backup must be restored over the top.
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