I suggest you get away from the Windows backup program and get yourself a good commercial backup program. I've seen forums fraught with problem reports for the Windows one. I know I was very unimpressed when I tried it. Two I'm familiar with and like are Easeus Todo Backup Free, and Memeo which has a 30 day free trial and you can buy it for $29.99. Both of these will do incremental backups.
The March 2012 issue of PC World was very high on the FREE program from Easeus and so is CNET. In my experience with a variety of configurations I have to say I'm very impressed. Like Ghost (which unfortunately is no longer on the market) it will back up to a networked drive, and it will create a boot CD for when your PC won't boot. Don't download from CNET unless you want to get malware, but you can see CNET's review of it at
http://download.cnet.com/Easeus-Todo-Backup-Free/3000-2242_4-10964460.html?tag=mncol;1#editorsreview .
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CNET has a lot of backup program reviews at
http://download.cnet.com/windows/backup-software/?tag=contentBody;sideBar .
Some of these are free (last time I checked there were over 300), some have free trials (over 1000), and some are purchase only (over 200).
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External hard drives are best for backup. You can get a 500 GB one for around $50 and a 1 TB one for around $50. You can also buy a 32 GB flash drive for under $20. It's the best insurance you can ever buy!
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I hope this helps. Good luck
Hi !
I'd like to find a good backup provider. If possible a free system to save my pictures and personnel files. It has to be really secure. Which important points i've to check?

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