Archive : When you back up a file, the archive bit will be cleared. Every time a file has been changed, the archive bit will be set, and the backup job will consider this file needs to be backed up.
Normal backup is the most time consuming.
Incremental backup are the fastest and smallest, however they are less efficient as a restore set. Because you need to restore a normal backup and then restore, in order of creation, each subsequent incremental backup
Differential Backup are more efficient than incremental backups as a restore set. The archive bit is not cleared.
However, to fully restore a system you would restore a normal backup and the most recent differential backup.
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