What is a differential Backup?
A differential backup is a backup type where only the changes that have occurred since the last full backup are backed up.
Differential backups are more storage space-efficient than full backups. However, these backups take considerably longer to restore as the underlying full backup has to be restored first.
Some advantages of differential backups:
- Backup creation is faster than that of full backups especially if few changes have occurred.
- More storage space efficient than full backups.
- Faster backup restore time than incremental backups.
Some disadvantages of differential backups include:
- Backup creation is slower than that of incremental backups.
- Backup restores are slower than full backups.
- Backups have a dependency on the full backup they are created from. If the associated full backup is missing or corrupted, the differential backup cannot be restored.