Quality in terms of memory cards pertains as much to speed as it does to anything else. Since you can pick up a 32gb class 10 SD card for under R200 it's not really a bad option as long as you buy two.
I had a 128gb Verbatim usb stick I bought in September die on me the other day and it was a bit of a schlep to back all that stuff up onto a second device but it had to be done. One copy on one device isn't a backup, it's a disaster waiting to happen.
I've got a stack of 20+ hard drives that I have to remember to spin up and check on a regular basis - if I could move all of that onto something that didn't rely on moving parts I'd be a much happier camper.