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What file systems are you using on your devices and why?
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Ext4 is a little fragile in my experience. It can get corrupted quickly when things go wrong. To be fair most hardware isn't going to cause an issue and I have only had a issue a very small amount. However, when there is an issue fsck tends to fail as it has no way to check data integrity. The result is a completely broken system filled with corruption.
Btrfs and ZFS are superior as they check the data as it goes across. (Especially ZFS) That isn't to say ext4 is bad as I just find it is hard to recover data from if things go very south. The benefit of ext4 is that is very simple. It doesn't have support for subvolumes, datasets or anything like that but it does just work.