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What file systems are you using on your devices and why?
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Btrfs, for the compression and CoW. I've been using it since a couple years. It seems stable for my use. I need to fully wrap my head around how snapshots work, though.
You mentioned CoW. I’m really taking advantage of this because I have multiple Wine prefixes that have lots of duplicate data. I want to give every application it’s own prefix, and my underlying file system allows me to duplicate the blocks so the prefixes are basically free where before it’s several hundred megabytes just to make a new prefix.