The online version only saves your return in your online account.
If you used the Online version you should always save both the PDF file and the tax data file each year (before online closes Oct. 15) so you have a copy when you need it or if you ever need to amend it in the future. You shouldn't rely on getting a copy from Turbo Tax. Or if you want to use the Desktop program next year so you can transfer from this year.
Turbo Tax Online automatically saves
https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-work-in-turbotax-online/00/26235
Save the PDF
https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-pdf/00/26...
Save the tax file
https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-tax-data-...
