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What file systems are you using on your devices and why?
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ZFS for nearly everything plus ZFSBootMenu EFI on root data pools. Get a bad upgrade? No problem, boot a previous snapshot (auto created with a pacman hook), which I had to do recently when 6.6.39 LTS kernel had a bug. Snapshots are also great when doing things such as upgrading postgres, hass, Plex, etc.
I've been using ZFS now for a few years for all my data drives/pools but I haven't gotten brave enough to boot from it yet. Snapshotting a system drive would be really handy.