It's a container with full os: systemd, journald, tailscale, ssh inside. No need to learn new docker world, just install the deb with your software inside
In a cluster mode, you can move container into another machine without downtime, back it up in full etc., also via one command.
In theory when using ZFS or btrfs you can do incremental backup of the snapshot (send the diff only), but I never tried it.
We can SSH in? X and Wayland forward comfortably? Their windows integrate with e.g. KDE? How about sharing files with the host os? USB devices such as cameras or Android devices?
It's basically advanced chroot with more security limitations. Or at least that's what LXC was when I looked at it. Then LXD added some standard tooling, sort of Docker lite plus fewer restrictions in some aspects (systemd supported).
In a cluster mode, you can move container into another machine without downtime, back it up in full etc., also via one command.
In theory when using ZFS or btrfs you can do incremental backup of the snapshot (send the diff only), but I never tried it.