PSA: CatCatNya~, as an instance, is currently involved in a potential legal case regarding _{(resolved by way of diversion)} Austrian StGB § 107c (essentially Cyberbullying), as well as German StGB § 187 (Verleumdung) against the natural person (Jeremy Kescher) hosting it.

As a precaution, assume the following can happen:

• The instance may disappear in the future (it will remain until legal proceedings end, unless forced otherwise by circumstances)
• The instance may change ownership in the future

This is an early warning. However, migrating away, downloading your archive, and then deleting your account may not be a bad idea. Data seizure has become unlikely at this point, so migrating away is, in my opinion, not something I suggest anymore.
Still, this depends entirely on your threat model.