Anytime unlocks features that are installed with every Windows 7 version but hidden in lesser versions.
MS wants us to unlock them with Anytime Upgrade key, but retail keys apparently work, too, probably because it makes them more money anyway.
The problem is on reinstall you might need to install/activate original licensed version then Anytime Upgrade again to higher version. But you should be able to avoid this by saving a Windows 7 Backup Image now as soon as it is set up as you like but before corruption begins creeping in.
Your Ultimate DVD can be used for reimaging by booting Repair console, and its ISO can be unlocked to burn all-versions DVD to reinstall the lesser version if needed:http://lifehacker.com/5438005/eicfg-...windows-7-disc