What is a differential Backup?

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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.