How can I recuperate deleted decks?

Hello, I really have a big problem. In my computer I used the option of “Download with Ankiweb” It said that all changes will be lost after the last synchronization.

I already did a synchronization but the last deck I did was deleted. Please can you help me to recuperate that, it’s very important and I took a lot of time doing it.

You can restore a backup file. Please see Restoring an Automatic Backup (Recovering from Data Loss)


Thank you so much