how to restore an entire UEFI system from an rsync backup

Hi Folks
I have just trashed my Slackware system. It refuses to let me login using known good passwords

I do have rsync backups of of the 3 filesystems that comprise this installation of Slackware64-14.0.
These 3 filesystems are mounted on /boot/efi, / and /usr.

SO:

Since the slackware on my box box is tentoesbellyupdead How can I
restore the entire system from the 3 backups?

Thanks in advance for your help!