ASR does not back up user files or other data, only data necessary for restoring the system configuration state.
In the event of a failure, an ASR restore is performed first, which allows user files to then be recovered.
Most of the Flash memory is used by the operating system, with 160 kB available for user files and applications.
The subscribers to a LivePC maintain their own store of user files which do not change as a result of system updates.
Kindle Fire's handling of user files is craptastic.
Separation of the operating system (OS) and program files from user files.
In larger systems, there will usually be additional disks containing user files, data files, etc. although these can all coexist on the disk, space permitting.
It will work for every user file, unless there is a conflict of security or an in-use condition that blocks it.
As a consequence not all the space on an HDD is available for user files.
Home Folders: stores all user files on the network.