I confirm that the binary Linux client works well with my setup (Orange Pi with Armbian).
One problem I had: I could not make dattobd work. It is not yet Ubuntu 20.x / kernel 5.8.x compatible and fails to compile… So I disabled it for now.
I must check on this later for the coming release of urbackup which will include full image linux backup (afaik)…
Thank you again for providing the solution.