Cost to store all US phone calls in a year in cloud storage

3		Cost to Store All US Phonecalls Made in a Year in Cloud Storage so it could be Datamined
4		estimates by Brewster Kahle June 12, 2013, done to check feasibility of news reports of NSA survaillance
5		 corrections welcome: brewster@archive.org
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7		number of call-minutes per person per month	300	minutes (estimate from my family's usage)
8		sides in a phonecall (caller+receiver)	2	since most calls are domestic, only need to record a call once for each reciever/caller pair
9		number of people in the US	315,000,000	https://www.census.gov/
10		number of bytes/sec in a phonecall	8,000	this is the uncompressed number, could be compressed to 1/2 to 1/4 easily
11		cost of a Petabyte (PB) of "cloud" storage	$100,000	this is basically what the Internet Archive pays. Petabyte = 1,000 terabytes
12		Square feet of datacenter space per petabyte	16	2 feet wide by about 8 feet including corridor between racks
13		Power to run a PB	5	kilowatts
14		Cost per KWhr	$0.15	California costs (higher than much of the country, could be 1/2 in other places)
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18		number of bytes/min in a phonecall	480,000	calculated from above
19		number of bytes/month for a person	144,000,000	calculated from above
20		number of bytes/month for the US	22,680,000,000,000,000	calculated (divided by 2 because there is a caller and reciever, don’t need to double count)
21		number of PB/month for the US	23	calculated
22		number of PB/year for the US	272	calculated
23
24		Cost to store all phonecalls made in a year in the "cloud"	$27,216,000
25		Square feet to store all phonecalls	4,355
26		Cost of datacenter power for all phonecalls for a year	$1,788,091