All my sets got deleted

Dear Sir / Madam,

I had lots of sets on my ANKI app, because I’ve got exams in a few days. I decided to create an account and afterwards the app offered me to synchronise from the WebApp or to the WebApp (or something like that). I pressed on one of those, I think from, and all my sets got removed. I can’t find them back. Can you please help me? It is really important. Is there any way to get them back?

Yours faithfully,

Anki keeps backups of your collection that you may be able to restore from.
Please see Anki Manual