It's probably because Google mostly indexes public-accessible text and images. I have a home server with a few TB of Internet-accessible storage, but it's not p

It's probably because Google mostly indexes public-accessible text and images. I have a home server with a few TB of Internet-accessible storage, but it's not public. I can say the data is on the Internet, but cannot be indexed as it's not directly accessible. My cloud backup of that storage is on the Internet but it's not public and it's encrypted, so it cannot be indexed (maybe the NSA is crunching my 4096-bit key right now). Based on the infographic agilebyte provided (sibling post), I contribute to ~10TB of data that cannot be indexed by Google - and that's already 5% of the data Google had indexed by 2010!