In my experiments with RPi backups, I note that the SD card has a label and that label is used when the partitions are mounted (eg disk label: 0xbff5ebb9, and /etc/fstab using PARTUUID=bff5ebb9-01 and bff5ebb9-02).
Is it better that I (a) change my fstab to mount by partition name (/dev/sda1, /dev/sda2) and let the disk labels vary when duplicating across multiple Pi's, or (b) leave fstab to use the disk label and leave it the same across multiple Pi's?
There's also option (c) which is to generate a new disk label but update fstab accordingly on restore. I'd rather avoid that unless there's a convincing argument for it though.
I guess what I'm asking is how much it matters if lots of Pi's have the same disk label, and also weighed against that how much it is an advantage to mount based on disk ID instead of partition number.
Mark