dhtseany [1] filed a deletion request for backup-testing-git [2]: I, the upstream dev as well as package maintainer, no longer make the app with a testing branch and therefore this testing package is no longer necessary. Please remove this testing package from the AUR.
[1] https://aur.archlinux.org/account/dhtseany/ [2] https://aur.archlinux.org/pkgbase/backup-testing-git/