IOS 6 compatible with iPad 2?
Sorry, I think I misspoke. You don't "restore" - you do an upgrade. And, AFAIK, an upgrade does not remove your apps and data. Only the iOS is changed.
Although it never hurts to do a backup, just in case something happens...
So, yes, a restore does wipe the device (and then you'd put your most recent backup on the iPad), while an upgrade does not wipe the device.
Sorry that I got a little confused. As a "jail breaker," I normally don't do upgrades. I do restores (and put backups on).
Hope that helps. If I muddied the waters too much - please, holler back. :)