Pressing CMD+R on startup, after selecting the source to restore a Time Machine backup, an external HDD partition is being refused, the error message roughly states:
A Time Machine backup of an APFS system can't be restored onto a non-SSD partition
It's not a backup of an APFS system tho, it was a regular journaled partition - is there a solution to this issue, is it a bug?
(I've tried formatting the partition as a journaled partition, afterwards an APFS partition, but the result doesn't change)
(I needed to make sure I had a bootable copy of my old main macbook before wiping it and sending it for repairs, this issue is sadly preventing me from doing so, as I need an active reference of my old system)
Edit: Tried restoring an earlier, Sierra backup, however, that fails too as a High Sierra system can't restore a Sierra backup ...