USB3 is just the latest version and is (considerably) faster than the previous versions. But to take full advantage your machine AND the external device need to be USB3. An older machine may not be USB3, but a USB3 stick will still work with it.
Seems a bit drastic to scrap an external disk. They can get damaged but also something simple like a duff cable or power supply can cause issues. Or even a reboot sometimes fixes it. And that's before you start the technical troubleshooting!!!
You really don't want to be wasting your time (and disk space) copying the whole 75.8 Gb of disk every time. You determine where your data is and only back up that part of the disk. Better still use a synchronisation program, take a base syn of everything then each week just run the program again to update your backup with any changes. You could even run two versions of this so you always keep an older version in case of mistakes.
Sync programs aren't difficult to use, once set up. You determine what you want to sync, then the job is saved and you just go in whenever you want and run it. You have options like whether to keep older versions of files (but this increases the storage you need). Most also have a scheduler so you can set it to run automatically according to your schedule.
Finally if you have the space you could image your disk which would not only back up your files but also mean you can recover your PC back to that date if something goes irreparably wrong with your Windows. You can image the drive say once a quarter which would effectively give you an extra backup.
Once again, I'd be happy to assist setting stuff up (free) if required.
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