@hrefna I think it partly depends on what you mean by 'mastodon compatible'. if you’re running straight up mastodon, forget it. not possible. if you’re running an implementation of some of the recent data portability FEPs, all 3 are doable. The tricky part is - how much are you automatically porting over (identity, posts, social graphs, reactions, etc etc). And whether the old server is alive to provide support or not. But it's all doable.