I’m fine with RAID5. Though I’ve seen the case where one drive failed and another one had several bad sectors and maybe was at the brink of failure, too. We were able to rebuild the RAID and replace both drives succesively but lost a few files. I think chances are slim, though. And even with RAID6, chances are your house burns down or lightning hits the neighborhood or a thief breaks in and takes the entire server. Or you or someone deletes stuff. So it doesn’t really replace a backup in any case. I’d say RAID5 is fine for home use. Take backups of your most important files.
How does it know in which community to post?