Let's ensure you can find the information on your deleted estimate, @Nroskos.
Currently, we're unable to recover it automatically. What we can do is to recreate it manually. We can check the Audit Log to get the details needed to reinstate the deleted transaction.
To access the Audit Log:
Go to the Gear icon.
Under Tools, select Audit Log.
Locate the estimate and click the View link under the History column.
From there, you can re-enter the transaction using the information with its original transaction date.
We're always here to help if you have any other concerns regarding deleted estimates in QuickBooks Online. Just add them to your reply below. Stay safe.
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