
Back in the early 2000s I was a teen on a 56k dial-up modem. There would be frequent connection drops, or if not that, my dad would simply kick me off the Internet so he could make a phone call. Trying to download large files through the browser would only end in tears, so a download manager that supported resume was absolutely essential.
I used something called FlashGet (I was a Windows user back then) which looking it up now apparently turned into a malware-riddled mess towards the end of its life, as did so many things. But it was an absolute lifesaver at the time.
All your old stuff will stay visible even after lemm.ee goes down, but it won’t be linked with whatever new user you create on another instance.
If export and import of posts and comments was possible it would result in “duplicating” your posts and comments to your new account, which as you might imagine would be an absolute mess (not to mention technically infeasible - how would comment chains with other users work?) so you can presumably understand why it isn’t.
It’s quite annoying for sure (and I’m a lemm.ee user too, so I’m also annoyed with everything I’m losing) but this is the trade-off we accept with federation that allows Lemmy as a whole to be robust and keep going even without lemm.ee