Many errors when backing up Mac OS

[winwin]

Do Mac users here use FFSync to backup up the entire OS and User data? I received hundreds of error messages that FFSync can not backup various operating system files. Do you use FFSync just to backup user data or is there a way to backup and restore the entire file structure, OS and all, down to the root folder?

[therube]

I would think it not to be expected that a file backup program would back up an entire OS, & in particular the OS system files themselves, & certainly not in any bootable fashion (such that you can restore to some saved OS state), if that is your intention.

[xCSxXenon]

Use Time Machine to back up your OS, it is simply the best option in existence.
FFS is not a system backup/restore tool and shouldn't be relied upon for such use