Hi there!
That's unexpected. What do you see on ankiweb.net? It sounds like ankiweb had unexpected contents (that is: it was missing the deck you wanted) otherwise why would the sync delete something?
When you say the backup/restore isn't working, that is also strange, but you have not mentioned if you received an error message or anything to indicate *how* you know it isn't working so it is difficult to help
In general our best wisdom on lost data is here:
https://github.com/ankidroid/Anki-Android/wiki/FAQ#lost-my-cards
Hello there!
My deck on Ankidroid was deleted when Syncing. Altough I have the file on my mobile phone, but it is not opening! the backup restore isn't working either! what to do? --
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