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What's with all these hip filesystems and how are they different?
(lm.paradisus.day)
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Pretty much, yeah. At some point I remember the recommendation being having a separate /boot as well due to incompatibilities with GRUB's save default option iirc, not sure that's a thing anymore.
Anyway, you usually set that up during the install process, although I'm not sure graphical installers let you handcraft btrfs subvolume mount points or even select them as such these days. Last I checked at least they either just used a default layout (@ and @home with Ubuntu, for instance) or treated it as a single volume with no further options.