I've tried a few dozen different methods of making backups and nothing ever really works- if you want cheap, it won't be automated or simple. If you want simple, it won't be cheap. If you want automated, you might miss something.
While 16 gb of data seems like a lot there are days I shoot 16 gb before lunch- when mentoring HS students and filming events you can blow through 16gb very quickly. Now there are some great photo applications that offer you opportunities to back up everything, but I'm just really not into those as I don't trust them.
My suggestions, which work for me-
DIM (Digital Image Mover). Download, rename, renumber, date, and CRC check your files.
(I really wish.... it had a dual copy method).
Immediately burn a DVD backup. I've gotten lax here because I started shooting more... otherwise... ...insert another 500gb to 1tb drive into an external e-sata or usb3 reader and copy all files that you just downloaded (or run DIM again) to the external device.
Duplicate that a third time.
Disconnect both copies.
When one is full, add another drive and store off site.
I have about 10 different HDs in rotation and store images on my media server as well as the internal hardware RAID-5 system. Hard drives go to my Father-in-law's place for backup.