I think the advantage of a bootable backup is that it is there, and you can just boot from it (or copy it to an external hard drive if it was on a remote volume

I think the advantage of a bootable backup is that it is there, and you can just boot from it (or copy it to an external hard drive if it was on a remote volume). The point is that the backup was already in the right format. I think internet recovery is more about restoring from a time machine backup, which takes forever.