I have installed Openmediavault 4 on an Emmc that I use on my Odroidxu4 and it works perfectly now with Nextcloud / Subsonic after the help of my cousin.
How do I backup Openmediavault 4 (Emmc) so I'm free to do it all over again in case Emmc gets worn?
I'm not Linux nerd so would like it to be as simple as possible? - I have a windows machine and a usb emmc card reader from odroid in case i need it?