Should I convert all my iTunes MP3 files to AAC?

Somehow, I only learned about the advantages of the AAC format a few days ago--despite getting my first Apple computer way back in 1984.
Would it make sense to convert all 80 GB of my iTunes MP3 files to AAC in order so save disk space in my backup before migrating to Yosemite?
Thanks again everybody for all your great help and suggestions.

No. If you originally got them from CDs, you can reimport them as AAC if desired.
(117182)

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[email protected]

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Welcome To  Discussions AKalel!
Do you have the free iTunes For Windows installed on your PC?
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