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Difference between incremental and differential backup

Differential or Incremental backup are part of the options that need to be selected when installing a backup software. Or the system admin has to choose which backup strategy he or she will adapt. Backup is very important so you have something to rely on when disaster strikes.

So, what’s the difference between differential and incremental backup?

Which one is better?

Differential backup – contains  the files that have changed since the last full backup. So, if the full backup was Sunday, Monday will have files that changed since Sunday backup.

For the differential backup of Tuesday, it will contain the files of Monday and the files of Tuesday.

Differential backup = requires large space since every differential backup has the files that had changed since the last full backup

Incremental backup – backup only the changed data since the last backup. So, if the Full backup was done on Sunday; Monday backup will only have the data that has changed since last Sunday or the previous backup that has just finished.

Tuesday backup, will have only the data that has changed since the Monday backup.

Incremental backup = less space compared to differential since each incremental backup does not have a copy of the previous backup, it will only contain the copies of whatever had changed from the previous backup. 

But during recovery, it will look for the full backup and the other copies of incremental backup to complete whole recovery.

Illustration of how many sets are needed during backup recovery, a good backup is when you can recover the data once you needed it. So, backup disaster recovery exercise is just necessary.

 



But sometimes a simple method of backup just to protect from any data destruction, a simple method of copying data will do.

Check out this link below which uses the Windows Robocopy to backup data.

https://quickbytesstuff.blogspot.com/2019/10/robocopy-backup-using-task-scheduler.html


Cheers...till next time. Stay safe and keep praying that this pandemic will end.

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