The next NAS I build will probably be BCache + BTRFS. Since Reddit hasn't given me much of a help as of late, I have been using ChatGPT to get pointers - or local LLMs when I need to use private data I'd rather not send into the OpenAI hellhole. But hey, never knew BCache was a thing, and that it so seamlessly worked with BTRFS... assuming it didn't h allucinate, that is, lul.