Thanks, got it.
Your SSD has your new OS installation, some freshly installed programs and user account/preferences.
The Barracuda has secondary programs installed. (when all drives have been configured, your user folders, i.e. Docs, music, downloads, should be relocated here from the SSD, keeping them safe and separate from the Boot Drive.) You can then backup, Data only, from the drive.
the Goflex has a complete backup of my original Gateway (F)
The only information on these discs that is of use to you are program installation files, (if you can't find newer one on the Net), files containing Date like, Address Books, Docs, Pictures, Music. Favourites and bookmarks from your browser.
Once you have sorted out and saved, you can delete info on the Goflex and wipe/format the internal Gateway drive.