Lots of good points here...yet another comment:
Make sure you create PDF files for TTX 2012 and before on your Windows computer, and transfer those PDF files to your MAC as PDF files...because for those years (2012 and earlier) you will not be able to fully install the tax software on your MAC.
Why? Because you will not be able to update the software to the final versions, nor will you be able to download the state software for those earlier years.
You should be creating two PDF files of your final tax return(s) every year : 1) Just the bare PDF of the final tax return, and 2) The copy with All Forms and Worksheets.
And to re-iterate..Back up those two PDF files, and a copy of the final .taxyyy datafile on a flash drive, or other independent storage .......imagine your situation now if that Windows computer had totally crashed.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
