I'm about to help a user with a huge user account folder. The appdata folder contains unknown things, including over 200 gig in the hidden INetcache. The user's Documents and Pictures amount to around ...
Windows cannot copy file \\?\C:\Users\UserName\AppData\Local\Microsoft\Windows\UPPS\UPPS.bin to location \\?\UNC Path\UserName.V6\AppData\Local\Microsoft\Windows\UPPS ...