What's the best (as in safest and/or easiest) way to be sure one can
revert to the previous xubuntu version when upgrading?
I have a desktop running xubuntu 20.10 which I want to upgrade to
21.04 and, as it has quite a complicated boot setup due to having a
non-bootable NVME SSD with the OS on it I want to be sure that if
something goes drastically wrong with the upgrade I can get back to
20.10 without too much hassle.
The disk drives are currently as follows:-
/dev/nvme0n1p2 ext4 48174 15701 29959 35% /
/dev/nvme0n1p3 ext4 896193 295874 554727 35% /home
/dev/sdb1 ext4 10016 183 9306 2% /boot
/dev/sdb2 ext4 109596 33138 70850 32% /scratch
/dev/sda1 ext4 938772 222369 668694 25% /bak
As can be seen the main OS installation is on /dev/nvme0n1p2 (which is
not visible to the BIOS). /dev/sdb1 is a partition of a SATA disk
which the BIOS can see.
If the upgrade to 21.04 fails I need to restore the / filesystem on
/dev/nvme0n1p2 and the /boot filesystem on /dev/sdb1.
I have space enough on /scratch and /boot (or on other systems,
probably even safer) to copy these filesystems but what's the easiest
tool for doing this? Ideally something bootable from a USB stick that
can do a backup/restore of a filesystem to/from a file.
--
Chris Green
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