While it looks like I'm bagging on PaperBack I'm not really. I am impressed with the concept and implementation, the same way I'd be impressed by a steam-powered cell phone or those guys that built a nuclear reactor into a B-29 just to see if atomic airplanes were feasible. Incredibly cool, but seriously: WTF?
2D barcodes are a mature product. UPS uses them on their packages for routing information. Chances are, your drivers license has a K or two of data encoded on the back using 2D. Assuming you have the right kind of laser gun, download one of the many 2D barcoding SDKs out there and get to work... the ability to encode naked pictures of yourself on the back of your businesscard is but a day's sweet labor!
My point in posting was to point out the absurdity of this technology for future-proofing data. The suggested use of making durable paper backups usable by future generations was just too amusing to ignore.
If something is so important that you worry your great-grandkids will suffer for not knowing it, then become a famous author and publish your data as an appendix to one of your works. Millions of your books will be published, sold, kept in libraries and dusty warehouses, traded by airplane travellers and left in nursing homes and doctors offices. Hundreds of years from now at least ONE of your books will survive, insuring your AOL password (or whatever) is safe.