High Quality Content by WIKIPEDIA articles! Retrospect is a family of backup software applications for the Mac OS, Mac OS X, and Microsoft Windows operating systems. Its maker Dantz Development Corporation was acquired by EMC Corporation in 2004. In May 2010 Retrospect was sold to Roxio/Sonic Solutions. In 2011, development of Retrospect was turned over to privately-held company operating under the name Retrospect, Inc. The first version from this company, Retrospect 9, was released on November 2, 2011.