[CaptArmchair]

That's possible:

https://docs.joinmastodon.org/user/moving/

[lambada]

That doesn't move your data to another instance though. All Mastodon supports is - Putting a 'I have a new account' notice on your old account - Exporting your toots. They do not support importing toots, which means if the instance goes boom your old toots are, for all intents and purposes.