> For example, for YouTube alone, users upload over 400 hours of video every minute, which at one gigabyte per hour requires more than one petabyte (1M GB) of new storage every day or about 100x the Library of Congress

Hmm, something up with the sums in the middle of that.

400 hours of video every minute is much more than one gigabyte per hour. It's way more than one terabyte per hour.

Working backwards:-

1 PB/day =~ 42 TB/hour =~ 728 GB/minute