My Incremental Updates are Bigger than the Base, except one!?

Hi, i have TI8, and i have done a full image saved as

backup.tib which is 2.84gig

the second time i chose incremental, it saved as:
backup1.tib - 1.9gig

the third incremental:
backup2.tib - 125MB

the forth incremental:
backup3.tib - 3.17gig


I defragged before each backup, but im confused as to why each incremental is so big, except the second one, which is 125mb?
Why the inconsistency? shouldnt they all be small?

 

1 TIP only defrag before a FULL backup. NOT BEFORE Incrementals. All sectors will be replaced and thats why they get so BIG!

 

so are they basically independent now, or do i still need the earlier backups?

also why was the 3rd incremental 125mb? i did a defrag before each backup...

 

With FULL/INCs, when you select an image to restore from, you will need that file and all the previous ones.

 

Hello iHz,

Thank you for choosing Acronis Disk Backup Software.

Please accept our apologies for the delay with the response.

Please note that as jeremyotten mentioned the incremental or differential backup created after a disk is defragmented might be considerably larger than usual. Please also have a look at this thread for details.

No, the incremental backup archive is based on the full backup and to restore data from the incremental backup, you must have all previous incremental backup files and the initial full backup. If any of successive backups is missing, restoration is not possible.

Please note that it depends on many factors such as how the disc was fragmented before the defragmentation or what data was changed since the previous incremental backup was created.

Thank you.
--
Aleksandr Isakov