Is it possible to have data backup? If so how long?

Except Google Earth is there any other authentic system that can provide cultivations image data of a field for last few years?

closed as too broad by PolyGeo Aug 27 '17 at 18:47

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  • I believe Google uses, at least in part, publicly available satellite and airplane imagery. They do some imaging on their own, but the bulk of their material is obtained from the public domain. – barrycarter Aug 27 '17 at 15:20
  • Concerning downloading Google's data Using Google Earth imagery data for portable solution? – underdark Aug 27 '17 at 17:42
  • As per the Tour there should be only one question asked per question. – PolyGeo Aug 27 '17 at 18:48