To backup your old system:
rsync -aAXhv --exclude={"/dev/*","/lost+found","/mnt/*","/media/*","/proc/*","/run/*","/sys/*","/tmp/*","*cache"} / /[TARGET]
If you want to remind yourself about how to install Arch Linux on a console that you can only access via serial console, checkout the official arch wiki article.
Or:
- Add
console=ttyS0,115200
after hittingTAB
in Arch Linux Image Bootloader