Personally I use RAID5, with regular backups for documents and projects. Not too worried if my movies and tv library get lost…that takes up most of the space though.

Use Infuse as your playback client. It will direct play AV1. However there is no hardware decoding support for it. But the processor is fast enough to do it in software for 24fps 4K. But not 60fps.

Current gen iPhone chips do AV1 hardware decoding. And the AppleTV uses the same processor, just a few generations behind. The next AppleTV hardware refresh may add AV1 hardware support. But that’s just a guess.