Look, it doesn't matter, links I've lost I can find again with google search. Thank you a lot for taking your time trying to help me. Next time, I'll expect the unexpected, and try to make backups on time.
If you're an admin, you can close or delete this post. Tnx again, bye. :)

The oldest local back-up I see in that menu here is of march 9th. This happened on 8th. So it's probably overwritten.
My everhelper account shinyumbreon289@gmail.com too. I don't know if there's any recent backup on your server, since I can't remember the last time I was even logged in while using the add-on, but if there is it would be really helpful.

No, tried everything I could find here and on google. Data just dissapeared into thin air, this is the first time to me. I gave up and restored couple months old version from the cloud. Really wish there was some internal auto-save that would back up on my pc list of urls after every change, that would be enough. I can't log in all the time to nimbus to make back-ups myself.