文档介绍:.Thismodeoffersavailable,convenient,on-putingresourcescanbeconfigured(resources,works,servers,storage,applications,services),theseresourcescanbequicklyprovided,justputitlessadministration,orwithserviceprovidersrarelyinteract.   puters,puteroraremoteserver,,,likegas,waterandelectricity,esstoconvenient,inexpensive..   putingservicecharacteristicsandnatureofclouds,hasacertainsimilarity,sothecloudisaveryaptanalogy.      :putingprovidesthemostreliableandsecuredatastoragecenter,usersdonothavetoworryaboutdataloss,virusattacksandotherproblems;putingclientdevicesrequireaminimum,isalsothemostconvenience;putingdataandapplicationscanbeeasilysharedbetweendifferentdevices;workprovidesalmostinfinitenumberofpossibilities.   Butontheotherhandtherearealsodisadvantagestwoaspects:first,itissafe,putingpoweranddatainthecloud,,oneisthedataisnotlost,thegeneralserviceproviderswillhavetheabilitytosolvebackup,asionallylost;Anotheristhatyourdatawillnotleak,althoughthiswilltakesomemeasurestoserviceproviders,nottooutsiders,suchashackerattackstogetdata,buttheproblemistheserviceprovider'