If this Gmail account was part of a work or school Google Apps domain, your admin can restore deleted email or Drive files for up to 25 days by following the step provided in this Google help article: Restore a user's Google Drive or Gmail data
This does NOT apply to consumer @gmail.com accounts.
If you didn't save the form responses to a Sheet before deleting them, they cannot be recovered after deletion.
I contacted Google support about this issue in the past and they told me the same thing - they don't have an undelete button for Forms.
They might be recoverable, but I sincerely doubt it, simply because of how long ago you deleted them.
According to Guiding Tech, the only way that you might get these back is by:
Click on the "Deleted" folder
Scroll to the bottom of the list of deleted messages. You'll find a bit of text that reads something like "Lost a message? When you recover deleted ...
Currently, there is no "undo" functionality on YouTube for deleted comments. Deleted comments are instantly deleted upon clicking on Delete button. You can request the "undo" feature under Send feedback option:
Yes you can get back deleted form Responses
i know this is an old post but this answer is for anyone else looking for the same solution to a similar problem quite recently.
You might have some luck here- google has quite a good auto backup system when it comes to sheets
Login on your desktop browser for easier access
Your form responses are generally ...
Any email you delete goes to your Trash. Just go to Trash just below Spam on the left vertical menu. However, you you have emptied your Trash, then it now depends on Gmail.
If Gmail has not deleted the messages from the server, you can recover deleted emails after deleting them from your trash folder. You must open your gmail then click the drop down arrow ...
We, Cognito Forms, archive forms (but definitely not entries) each night in order to provide assistance to customers that have accidentally deleted forms they spent hours or days perfecting. Please submit a help request specifying the name of the form you are trying to recover and we will see if we can help!
If you access your Google Drive online, you will see an icon with a letter "i" in it.
Clicking on this will show you the history of everything that has happened within that folder you are in. Go check the dates prior to the date the folders got hacked. I cannot guarantee that you will see dates of his files being uploaded but it's worth a try.
This is ...