Unfortunately ext4 and xfs are fast, but not reliable. They don't have data-checksumming, so it's very hard to know when you need to go to your backups. Their

Unfortunately ext4 and xfs are fast, but not reliable. They don't have data-checksumming, so it's very hard to know when you need to go to your backups. Their backup options are drastically more complex because there's no way to take an atomic snapshot. The complexity of data-integrity and backups are pushed a layer up, whereas more complex filesystems manage data-integrity and atomic snapshotting themselves, and can do so more easily due to existing at the correct layer.