Incremental or Differential Backup?

What´s the difference between these two types of Backups?
I have a full backup of HD C: normal compression, size: 3.5 gb.
I tried to take a new backup with new installed software. acronis recommends to do an incremental backup with less space. Now the new backup file taken is about 4 gb
now i have two image files: the original with 3.5 gb and the supposed incremental one with 4 gb
Is this the right way how acronis works?

 

An Incremental backup saves the changes from either the Full or last Incremental in the backup set. For example: Full >> Incremental 1 (based on the Full) >> Incremental 2 (based on Incremental 1) >> Incremental 3 (based on Incremental 2), etc.

A Differential backup saves the changes from the Full image. For example: Full >> Differential 1 (based on the full) >> Differential 2 (based on the Full) >> Differential 3 (based on the full), etc.

Incrementals and Differentials can both be as large or larger than a Full if things have changed a lot on the drive since the "base" images were created. A disk defrag or a TI restore can do this. In those cases, it's best to just create another Full image backup.

 

are u sure defrag also effect Incrementals backup size??

for Differentials backup i can 100% confirm for the Incrementals i didnt check

chers

 

"are u sure defrag also effect Incrementals backup size??"

Yes.

 

Ok 10x... so we keep STICK HARD to FDISR

 

OK, I admit it - I have no idea what that's supposed to mean.