I joined mastodon.xyz a few years ago and never had any problems. Then today I tried to sign on and couldn’t. The server simply isn’t reachable. I can (and have) created a new instanceuaccount on a new server, but losing all my data has me concerned. What should I do with my new account so I don’t lose everything if this instance also disappears someday?
Look for an instance that has adopted the Mastodon Server Covenant, points 3 and 4 deal with this situation. It’s just a promise, not a guarantee, but most people running such instances are doing it because they care deeply about their community.