Acronis True Image is a fantastic product, with lots of features other than just incremental backup.

For pure incremental data backup it's hard to beat Retrospect though.

As a professional photographer working digitally, my data is my livelihood. I use Acronis True Image to make an image of my system drive (3 times a week) and entrust my data to Retrospect (every day).

As an all rounder, though, TrueImage is the way to go. 

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