This reads like the dystopia in which every piece of software got replaces by a proprietary web application by some evil mega corp. What you need is at least a mail client and a word processor.
Now I get your point, sorry. You can use both Timeshift and BackInTime as snapshot tools, but also configure them to create snapshots on a different drive, making it an actual backup.
I for example use Timeshift in Rsync mode for that reason even though I'm also using Btrfs, which Timeshift supports, but only for non-backup snapshots.
Sorry for the confusion, I guess when suggesting both those tools one always has to specify that you need to save snapshots on a secondary drive for it to be a backup.
No, Flexo is not like Unattended Upgrades.
Flexo just downloads packages in a cache for you to download them locally using pacman as usual. It's mainly to increase download speeds and decrease doubledownloadsing the same files in one network to different clients.
Unattended Upgrades is actually installing security updates automatically without user input. This is by design not supported and not possible on Arch Linux.
Just mass-report the Discord server I guess.