I use rclone and the gui https://rclone.org/gui/ in my proxmox environment.
That said, the backup itself is still initiated via batch script.
Edit: to backup my PC and all smartphones to my server I use syncthing.
And the rclone backs the data to an cloud system. Some parts encrypted
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I went for the ASRock J5040 board, 16gb ram (yes it works) a 500gb m.2 as system using a PCI adapter , 2x4tb ironwolf as ZFS mirror pool, 350 W power supply all in the node 304 fractal case for 550 euro.
Runs proxmox as hypervisor for VM or Container. 6 LXC running motioneye, plex, pyload with openvpn, syncthing, rclone cloud backup and openbookshelf.
Typical power usage is around 20W
Ripping myself is what I did with Libation as suggested here. You log into your audible account when starting the software for the first time, your libary is shown and you can start to download.
When adjusting the auto tagging then audiibookshelf automatically sorts the stuff in the correct way with series etc.
Perfect combination and totally free.
Not for ripping but to serve your books and for the selfhosters among us use audiobookshelf.
Really great piece of software
I use syncthing to collect my data from several devices (smartphones and PC) to my server at home, when I am in my home network.
Then, on the server, rclone takes over with various daily/weekly tasks and syncs the stuff to my cloud storage. Some encrypted some plain. From my mobile or my pc I have access to all the data either at home or via vpn as well as directly to the cloud backup.