Why we regard server disk image software as the best choice of server backup solution? Because of the quick imaging speed? Storage space saving? Let us learn server disk image first.
Server disk image not only is a storage device, it also can be a single file. It contains complete contents and structure representing a data storage medium or device, including hard drive, tape drives, floppy disk, CD/DVD/BD and key drive, but an image of an optical disc may be referred to as an optical disc image. The server disk image can be created by making complete sector-by-sector copy of the source medium to finish replicating the structure and contents of a storage device perfectly. Of course, the unused space can be omitted during disk imaging upon your decision. In addition, the image file also can be compressed to certain standard to save space, and store in another place. All depends on your requirements.
In a word, server disk image is a copy of your Windows Server 2012/2003/2008, but it is smaller and removable.
Now, server disk image can be used to backup and clone disk of floppy disk media, where replication or storage of an exact structure was necessary and efficient. Then server disk image software came out. Don't copy unused space makes image backup software save more time and space than other backup software.
This is the kind of image backup software for Windows Server 2012/2003/2008, and you can use it to simply backup server system to image file.