Comment by yndoendo

I also have the same Arch install from 2014 on my main hardware. Each replacement computer is nothing more then taking the old drive out, placing it into an USB enclosure, booting a USB live, setting up the partitions on the new drive, and _rsync_ the content from the old to the new, finalizing with registering the UEFI boot loader.

One just need to make sure that you use the proper _rsync_ command options to preserve hard links or files will be duplicated.