You do pay a lot for the fancy metal case with the GDrives but i have used literally hundreds of them and never had a problem with them. Worth the money. It is not the USB interface that is the problem it is the quality of the actual drive and them being able to handle writingg and reading tons of data without failing.
What i would say would be to go ahead and get a cheap drive and use them purely as an archive (i.e. backup your work once and then not touch it again) and get an expensive but fast and reliable drive to do your time machine backups and day to day work onto which you can rely on to use if anything ever does go tits up.
You do pay a lot for the fancy metal case with the GDrives but i have used literally hundreds of them and never had a problem with them. Worth the money. It is not the USB interface that is the problem it is the quality of the actual drive and them being able to handle writingg and reading tons of data without failing.
What i would say would be to go ahead and get a cheap drive and use them purely as an archive (i.e. backup your work once and then not touch it again) and get an expensive but fast and reliable drive to do your time machine backups and day to day work onto which you can rely on to use if anything ever does go tits up.