Yes, they should restore perfectly.
For safety:
1. Do a complete DM backup first
2. Backup your third party apps first following the instructions in this thread:
http://www.blackberryforums.com/rim-...arty-apps.html
Proceed with the instructions for the upgrade in the Sticky Thread for the 8310 model.
IF you have any registered or purchased apps, write down any license key or passwords first, as routinely some of those will need to reconnect and re-register (like Viigo, TeleNav, etc.).