Quote: Originally Posted by thekb
Nope, it doesn't compress. Or if it does, it doesn't show. Everything you backup is restored bit for bit, as it was in the beginning. I had this worry when backing up some movies in Blu-Ray format, but the clarity is intact. Backup without fear!
Actually, you are incorrect. Windows backup does compress your files into a lossless zip format for the data (non-image portion) of your backup. For the image format it uses VHD files. I am not sure if the VHD is compressed or not, but I expect they are.
Anyhow the main point is that any backups software's compression algorithm is lossless, so what you get back on a restore is a bit for bit exact copy of the original - there is no reason not to use compression in backup except that it uses CPU resources and may take longer to backup on older CPUs.