Cards deleted after attempted sync

[Marting]

After attempting a sync earlier this morning my anki flashcards were deleted mysteriously. Is there any way that we could recover those cards?

[cqg]

Restore from an automatic backup
https://docs.ankiweb.net/files.html?#backups

After that, upload from your device to Ankiweb.

[dae]

Please see this page for instructions on each client: Restoring an Automatic Backup (Recovering from Data Loss) - Frequently Asked Questions

[Marting]

Thank you!