i started on lemmy.ml but it’s been down for a day or so, cant access anything I did over there, so I started over here too. I’m probably wrong but it seems, from what others have said (over the last few days I’ve been trying out this federation platform), an account’s activity/comments are tied to the sql database on the server - so if the server goes poof, so does your account.

From what I’ve heard, at the current time no. But should be happening in the near future.

You can also use a mastodon account to sign up.

From what I’ve heard I don’t think so, but I may be wrong, or someone might build a tool in the future

No, you can’t. Your instance will go down, but all your posts and comments will still live in read-only mode on the instances they been federated before.

In mastodon (another activity pub service) you can export your account with subscriptions, but not the posts. So, if it’ll happen, you gotta start from scratch.