Actually you have to fear the risk of censorship on nostr even more. Any relay your profile is connected to can remove your notes anytime any one of the relays feel like it. I've lost over a years worth of notes & I have to make backups because I can't tell which relay is doing it, why or get a answer from anyone on why this is happening.
Discussion
Paid relays you haven't supported maybe? Not a problem if you run your own relay. There is also a service called nostrsync that will throw your stuff all over multiple relays.
I wish I knew how I could setup a relay. I would probably have to buy a vps.
So if you are looking for just personal backup rather than hosting a public relay for everyone, its actually quite simple to setup. I have a raspberry pi running umbrel and it has a locally hosted relay that i connect to one of my npubs. You also should try nostrsync.live and run a DeepSync which will go into a whole bunch of relays and pull old data. Some relays make copies of others so there is a good chance that running that will pull up your old stuff. Let me know how it goes.
Could you set it up on a android phone?