Then maybe even a USB flash storage thumb drive or two would suffice, as they are cheaper than an ODD.
But I get why you want to do this.
I have backed up probably 200 GB to DVDs seven years ago, stored the DVDs in a sealed environment, where no light or humidity can reach them. I am lucky to still be able reading a third of them.
If you only need to backup 10 GB or so per year, that would be writing 3 DVDs per year at most.
And reading one DVD daily would probably also not wear down the small drive either.
I just have had bad experiences with two SuperDrives, they broke down in a matter of years, and I did not even use them for the backup session seven years ago. I however used the SuperDrives to rip my entire CD collection, 300 CDs or so, and no SD lasted longer than four years for me.
But again, your stated needs probably do not put that much tear and wear on that SD anyway, thus it might be more than okay with you.