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Btrfs RAID5/6... anyone here every tried it?
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It depends on what you call "real" data.
I find it good enough for home NAS that serve as jellyfin instance and store a hell lot of stuff. Things I would rather keep, but anything really critical is stored on several computers.
Works well so far (about 4 or 5 years already now) with raid5 for data but raid1 for metadata.