Incremental and Differential backups are the major means of safeguarding vital data from loss, corruption, or disaster. They are effective methods of storing data because they are based on deltas, that is, the change since the last full backup. In this article, we will compare incremental and differential backups, specifically about how they work, what the pros and cons of each are, and the circumstances where he/she should use each of them to help you establish which one of them meets your requirements in data protection and recovery.
What is Incremental Backup?
Incremental backup only backs up the modified data from the full or last incremental backup. This is usually faster to build and recover than the first method, and it requires less disk space. Thus, it is ideal for organizations that deal with large databases.
Recovery in Incremental Backup
What is Differential Backup?
Differential backup, on the other hand, only backs up data that has occurred since the most recent complete backup. It uses up more memory, but a fair deal of stress is saved during the recovery process as compared to the incremental backup only, where the user needs only the last full and the last differential backup.
Recovery in Differential Backup
Difference Between Incremental Backup and Differential Backup
| Incremental Backup | Differential Backup |
|---|---|
| Faster to create backups since only changes from the last backup are saved. | Takes more time as it backs up all changes since the last full backup. |
| Slower recovery process because all backups must be restored. | Faster recovery, requiring only the last full and the last differential backup. |
| Uses less storage space since only changes are saved. | Requires more storage as changes since the last full backup accumulate. |
| Requires less bandwidth due to smaller backup sizes. | Uses more bandwidth since more data is backed up compared to incremental backups. |
| Higher risk due to the need for all backup sets to be intact for successful recovery. | Lower risk as fewer backups are needed for restoration. |
| Searching for files can be complex due to segmented backups. | Easier file retrieval since fewer backup sets are involved. |
Conclusion
Both incremental and differential backups play crucial roles in effective data protection strategies. Incremental backups are efficient and quick, capturing only the changes since the last backup, which conserves storage space and reduces backup time. On the other hand, differential backups, while requiring more storage, offer faster recovery times by backing up all changes since the last full backup. Choosing the right backup method depends on your specific needs, including the frequency of data changes, available storage, and recovery time objectives.