SAVE every Year as a PDF file....as soon as your tax file has been "Accepted"....and back them all up to a USB flash drive. (Printing and saving in a lockable file drawer is also recommended. Putting a second USB-flash drive, with everything important, in your bank safe-deposit box every year is up to you...but I do it, switching out the older one to update and put in the box next year.)
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You are usually not able to fully install the desktop tax software for any year beyond 3-4yrs old. So having the .taxyyyy datafiles older than 3-4 years may be useless to you on the new computer. The PDF will likely be readable for many years into the future.
____________*Answers are correct to the best of my knowledge when posted, but should not be considered to be legal or official tax advice.*
