If you are still looking for an alternative, https://lemmy.zip/ is a solid choice. Similar moderation policy than lemm.ee.
Monthly reports: https://lemmy.zip/post/39959863
Lots of lemm.ee users moving there: https://lemmy.zip/post/40323214
If you are in the UK (where lemmy.zip is geoblocked due to UK laws), https://feddit.uk/ is a good option.
You can export your subscriptions, blocks and saves from “Settings - Import/Export settings” and then import them on your new account.
There is no backfill mechanism. Only the servers online and federated at the time of posting will have the content. New servers will not. If you move to a new server it won’t have your old content