Jpeg is a non archival standard sorry Jpeg 2000 is considered somewhat archival but not by much classic Jpeg is in fact one of the worst image data formats ever. Tif is the standard because it still works after a bitfailure which happens quiet often, a bit failure in a jpeg file and the file is toast. For Cloud computing is pretty new and there still a lot of legal issues. Again Standard PDF is not considered a long term digital preservation file PDF/A is.