Did you use the Desktop CD/Download program? Then sorry, the only copy was on that computer and any backups you made.
if you used the Online version you can get a copy. How to get a copy after filing
You can request a transcript from the IRS
For a fee of $43 you can get a complete federal tax return from the IRS by completing Form 4506
When you use the downloaded version and you efile the return it is passed thru to the IRS on your behalf and a copy is not preserved by TT no more than the postman would keep a copy of any mail you posted.
As you go along you really need to save a copy of the return frequently as you complete the return so if something happens you don't have to start over from scratch and/or you accidentally delete something by accident. Always save to a removable storage unit as well just in case the CPU crashes.