They are stored on your own hard drive--not in an online account. When you use desktop software you save your returns to your own computer or to any back up device like a flash drive.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/find-last-year-tax-data-file-...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/data-systems/find-tax-data-file-mac/L4VN...
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