Friendly warning to anyone who like me thought I could uninstall Steam from another partition then copy my library back over 
Just lost 900GB as it has DRM on it so looks for where the files are installed & deletes the lot of them even though I moved them all beforehand as that used to work
When you uninstall Steam now it checks for the library & deletes the lot
this is ontop of it doing the usual ownership check if you move the files back after for every single game. Valve appear to have applied the encryption to your entire library not just certain games anymore 

Just lost 900GB as it has DRM on it so looks for where the files are installed & deletes the lot of them even though I moved them all beforehand as that used to work

When you uninstall Steam now it checks for the library & deletes the lot

