MarsSeed [1] filed a deletion request for backup-gmail [2]: Defunct, unused Python2 package from 2015. Upstream's last release was in 2011. [a]
I recommend deletion. I don't think it's useful to keep. There are maintained and working alternatives. [a]: https://launchpad.net/backup-gmail [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/backup-gmail/
