Iloco, it can't do that if you have backed it up, if you uninstall P7 and then re-install it, it will reinstall with a new runtime yes, fine!  But if you have a backed up runtime from P7 it really is as easy as deleting the P7 runtime and replacing it with your backed up one!! It still works because all the native P7 stuff is still in there!

Injustice will be avenged.
Cofiwch Dryweryn.