Image with Linux/Ubuntu

Hello, is there nobody here who makes an image backup of his Linux system disc with UrBackup?
Maybe I’m missing something fundamental? Or does it not work with UrBackup (which I can’t imagine)? It works very well with Windows.

I have not found a solution for formatting the ESP partition (EFI System Partition) unlike with VFat. As already written: Ubuntu only offers only ext4 and not ext2 or ext3. But the computer does not boot with ext4.

Is there a way to install Ubuntu without an ESP with VFat so that all partitions have ext4?

I have now found this link:
Server 2.5.1 WIP/Client 2.5.1 WIP

Unfortunately I don’t see a solution for the ESP partition there either.