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Incremental and Differential Backups please explain???

Asked in Computers & Technology at 5:44 PM on December 23, 2008

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arun nair
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A differential backup backs up only the files that changed since the last full back. For example, suppose you do a full backup on Sunday. On Monday you back up only the files that changed since Sunday, on Tuesday you back up only the files that changed since Sunday, and so on until the next full backup. Differential backups are quicker than full backups because so much less data is being backed up. But the amount of data being backed up grows with each differential backup until the next full back up.

Incremental backups also back up only the changed data, but they only back up the data that has changed since the last backup — be it a full or incremental backup. If you do an incremental backup on Tuesday, you only back up the data that changed since the incremental backup on Monday. The result is a much smaller, faster backup. The characteristic of incremental backups is the shorter the time interval between backups, the less data to be backed up.

Answered by Karthick AR at 6:09 PM on December 23, 2008

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Karthick AR

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Think of a differential backup as "difference" and incremental backup as "increment".

The difference backup should take the difference from the normal backup everytime it runs.
This means if I take 3 differential backup in a row they should all have the same data except the newest one will have the most recent changes.

The increment is used to take the change only from the last increment. If you have 3 increment backups in a row they will contain different data which will be sequentially ordered with increment1 being before increment2 and the last increment holding data from the change between increment 2.

The tricky part is MS throws in incremental and differential backups between each other which is why you must understand the archive attribute really well and its purpose.

The key to understanding the different backups is the archive atrribute.

This attribute is used by both backup methods when determining what data to backup. When a user makes a change or creates a new file the archive attribute will be checked.

What you need to understand is which method clears the attribute and which backup method does not clear the attribute. This will determine what gets backed up when both methods are used together. Otherwise if you only use one method and normal backup together, the backups are easy to understand.

Here is the breakdown

Incremental Backup = This method clears the archive attribute. It will backup data that only has the archive attribute checked, and when its done backing up it will uncheck(clear) the attribute.

Differential Backup = This method does not clear the archive attribute. It will backup data that only has the archive attribute checked, and when its done it will not uncheck(clear) the attribute.

Both of these methods can be used in conjunction with a normal backup, which clears the archive attribute. Everytime you run incremental it will clear the attribute, and everytime you run differential backup it will not clear. Both backup routines rely on the archive attribute to be checked in determining what data to backup.

Answered by Manu at 6:00 PM on December 23, 2008

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Manu

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1. If you back up your network by performing a full backup every Wednesday
at 6 P.M. and differential backups in the evening on the other six days
of the week, how many jobs would be needed to completely restore a
computer with a hard drive that failed on a Tuesday at noon?
2. If you back up your network by performing a full backup every Wednesday
at 6 P.M., how many jobs would be needed if you performed incremental
backups in the evening of the other six days of the week and a
hard drive failed on a Tuesday at noon?
3. For a complete restore of a computer that failed at noon on Tuesday, how
many jobs would be needed if you performed full backups at 6 A.M. every
Wednesday and Saturday and incremental backups at 6 A.M. every other day?

Answered by Arun Nair at 5:45 PM on December 23, 2008

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Arun Nair

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