A differential backup saves all changes made since the last full backup. Unlike incremental backups, differential backups do not reset after each backup, so they continue to grow in size until the next full backup.
Advantages
- Faster Recovery: Differential backups provide quicker recovery than incremental backups, as only the last full and most recent differential backups are needed.
- Balanced Storage Use: While differential backups require more storage than incremental backups, they use less storage than full backups.
Disadvantages
- Growing Backup Size: Over time, differential backups can become large, especially if there are changes between full backups.
- Longer Backup Time: The time required to create a differential backup can increase as more data changes accumulate.
When to Use a Differential Backup
Differential backups are suitable for scenarios where faster recovery is needed, but there is still a need to balance storage use and backup speed. They are commonly used in environments with moderate data changes between full backups.