MagCloud is an American online publishing service founded by Hewlett Packard in 2008 and sold to Blurb Inc. in 2014. Mag is an abbreviation for magazine while cloud is a synonym for online.MagCloud is an American online publishing service founded by Hewlett Packard in 2008 and sold to Blurb Inc. in 2014. Mag is an abbreviation for magazine while cloud is a synonym for online.