When you take backup with Link of your Nokia N9. It seems that Link does not know how to backup the images you have set for your contacts and Nokia Sync to OVI webpage might loose some of that images from your contacts in sync progress.
Also groups will be missing the images and and Nokia ovi Sync does not sync groups to OVI webpage.
There is also problem that backup does not backup all your contacts. I have now 10 missing contacts in phone but in web-page those contacts still are there.
I also can't get sync those contacts from OVI page even how many times try to press sync from N9. Also N9 and OVI page seems to create now duplicate contacts to OVI page in every sync.
There is some major issues with the Facebook and other contacts and the Phone Book contacts with the sync. Please Fix the Contacts and sync issues this is ridiculous. N900 with OVI suite did work better.