Hi there!
You should be able to restore from backup:
https://github.com/ankidroid/Anki-Android/wiki/FAQ#lost-my-cards
I accidently sync my card and now all my cards are gone. I had anki web on my ipad and anki droid on my desktop . I accidently clicked download and all my card are gone.
Please Help me, it took me so long to make those.
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