I do use btrfs, but I don't really understand how to use it to protect against bit rot. I tried to look into it at some point, but got overwhelmed. Did invest in two backup copies, one of them off site, though.
However, looking at prices, I can see one of those backups just being dismantled to be used as more storage.
However, looking at prices, I can see one of those backups just being dismantled to be used as more storage.