Most blossom servers I've seen so far are focused on being public. Haven had the only personal one I've seen.
I've had "personal blossom backup server" on my to-do list since I wrote the spec but haven't had the motivation to build it. The idea would be something like a personal FTP box that exposes a file system, downloads blobs from your public servers, and then serves all the blobs using their hash
@Pip the WoT guy just released
https://github.com/pippellia-btc/blossy so maybe that will be useful for building this?
I also built this a while ago
https://github.com/hzrd149/flower-cacheIts a local cache server that will proxy requests to other servers. not quite a personal blossom server but seems related