with online the only place the tax file exists is on Turbotax's servers which requires an internet connection. To avoid this you would have to save a PDF copy of your return on your computer.
even with the desktop version you need an internet connection to e-file and update the program. usually, there are some updates before the efiling season opens because the program is mostly based on the prior year with only some of the revisions for the current year included. Failure to update may void the Turbotax accuracy guarantee.
