Well, it's a simple matter to copy off all of your user data files if they're under C:\Users and even more so if they're under a single user folder there. If they're spread about by intention then only you'd know where they are.
Your paranoia is misplaced and this sort of registry editing, in the absence of both in-depth knowledge and extreme care, has results such as those you've suffered.
After you have your user data safely copied to an external device reinstall Windows 10 from scratch and use the privacy controls as they were meant to be used.
You cannot back up your installed programs, but if you have the installers for all of them you can back up those files. Installed programs become, for all practical intents and purposes, part and parcel of Windows.
Edited by britechguy, 29 June 2017 - 04:56 PM.
Added comment about installed programs
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1803, Build 17134
Memory is a crazy woman that hoards rags and throws away food.
~ Austin O'Malley