Go with Ubuntu 22.04.4 LTS, choose the always free ARM 4 core 24 gb ram. it runs like charm. The only thing that is not updating on arm is the Duplicity backup but read this thread how to snap install duplicity --classic --edge which is the latest version. Using MIAB On ARM - #2 by vele Oracle Cloud AS seem to have been listed on UCEPROTECT level 3 which might produce some deliverability problems.