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Re:Arch Linux turned 20 years old today. It was released on ... by fer on Friday March 11, 2022 @10:14AM (#30640869)
Depends because the partition and directory structure has changed over the years, but it generally boils down to rsync -avP6AHXx --numeric-ids src dest.

It requires some fiddling afterwards (not only grub-install: adjusting fstab UUIDs, adapt network interface changes, etc) but it's generally pretty painless.

Re:Arch Linux turned 20 years old today. It was released on ... by selbyk on Friday March 11, 2022 @12:33PM (#30643093)
I almost posted earlier about the after-adjustments. I have 5 and 8-year installs, but I've never bothered to migrate across machines thinking it'd be too much of a hassle.
Re:Arch Linux turned 20 years old today. It was released on ... by 12ian34 on Friday March 11, 2022 @03:48PM (#30645804)
Ah thanks - my go to rsync flags are -hvrtP which seems like it's quite similar. Still curious about what you rsync? Presumably this is within chroot during installation?