Restoring data after computer was stolen
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Upgrade Storage
You don't have to sync Zotero to use it, so this isn't automatic.
No other back-up? External harddisk/TimeMachine/Carbonite?
We obviously can't help you restore data that you never actually uploaded to Zotero servers. You would need a backup of your previous Zotero data directory from before your computer was stolen.
FWIW, you've not commented on these forums (which date back as long as Zotero) with this user account before today, so if you had help figuring out other problems, you may have a second account which could potentially hold data.
If you've synced with a different account, you'd have to find that account.
But if you still have access to the email addresses, you can also just try resetting your password using those addresses and check to see if you get reset emails.
https://www.zotero.org/user/lostpassword