When attemping a full system backup, /sys receives the following message:
"Skipping non LINUX file system
The following directory was included in the
file specification, but is not a native LINUX
file system and thus will not be included
in the backup.
/sys (Magic Number 0x62656572)"

I know there are several file systems you don't need to backup. Is this
still a valid backup or should I be concerned?