The Best way to save a picture is to .......
1.Upload it in multiple Online sites as Picasa, Kodak, Orkut, Facebook to name a few.
2.Physical copies of important Snaps, The file size will keep growing OR The Format will keep changing OR Websites will crash OR Our PC/Laptops will crash Etc....... I mean, look at 25 yrs down the line .... So Make a good album of Select few pictures .... it will be there for Centuries.
3.Store it in Cds, Hard disk,etc. But configuration will change, in a few years Hard disk will not be accepted by the New Latest technology Mother board. OR Cds will change to smaller Better version, we will not get a Normal cd player.
Hope it Helps ......
