Hm? Which part of the stack requires a lot of resources? Each part (PDS, Relay, AppServer (AppView)) can be run on a PI. Blacksky (not a large organization by any means and completely community funded) is almost running the entire bluesky stack themselves. IMO there's not much of a reason to run every part of the stack yourself unless you want to be completely independent from bluesky. At the very least if you want to host your own data then that just means running a PDS, which means finding the cheapest VPS you can that fulfills the min spec. Mine costs about 7 bucks per month and I never have to think about it. I'm also running a relay for no reason other than for learning purposes for about 30 bucks a month.
The AppServer, if you want index the full bluesky network (39M users) will run you about 200-300 dollars a month. Again, not really needed but you can if you want. There's also experiments people are trying out to only index smaller parts of the network, e.g. only users you follow which would mean hosting an AppServer would be even cheaper. FWIW, I like both protocols and want them to succeed, anything that gets people off of closed social media.
Regular backups help in this case, you can move all of your data to a new host if you have a recent backup somewhere and your rotation key. Not really approachable for the average user today but there are people working to make this easier.
The AppServer, if you want index the full bluesky network (39M users) will run you about 200-300 dollars a month. Again, not really needed but you can if you want. There's also experiments people are trying out to only index smaller parts of the network, e.g. only users you follow which would mean hosting an AppServer would be even cheaper. FWIW, I like both protocols and want them to succeed, anything that gets people off of closed social media.