[question] What part of the root FS does fsarchive backs up?

[rado84-github]

I can't find a forum for the program, so I'll have to ask here.

I read fsarchiver backs up the root fs but it isn't clear what part of it it stores. If I install fsarchiver in a live environment (meaning that my OS won't be running at the time) and start it, will it archive THE WHOLE root fs, like clonezilla does?
I'm looking for a tool that creates a backup of only the occupied space of a storage and since my /home, root and grub are on the same single partition (see the screenshot, if you don't understand what I mean), I'm hoping that fsarchiver will make a full backup of my whole system without missing any files. It turned out that clonezilla has its own problems, so I'm looking around for something else to replace clonezilla with.

[babiulep]

If you would do something like: fsarchiver savefs my_clone.fsa /dev/sdc1 you would have all the files for your system.
Of course you can use compression and multiple cores...

Afterwards you can check with fsarchiver archinfo my_clone.fsa the space used (ca. 24.5 GiB) and the original filesystem size (ca. 238.5 GiB)

[vorwd]

So, you want to take a partition that is (example): 250GiB total, 25GiB used and end up with a backup file that is 25GiB in size (uncompressed) correct?

fsarchiver does what I've said above. I've taken a 120GiB drive, with 8GiB used and did a savefs command from fsarchiver, and then took that 8GiB save and restored it onto a different 32GiB EMMC drive in another machine.