Microsoft Visual SourceSafe

Pijul is a free and open source distributed version control system based on a sound theory of patches, which makes it easy to learn and use, and really distributed.

Paragon Backup & Recovery is an advanced backup and recovery software. You may backup files, volumes and disks entirely or pick one at a time. Select the OS partition, and you get all the necessary boot partitions. If your operating system crashes, you can recover it easily.

DriveImage XML is a reliable program for easy imaging and backing up partitions and logical drives. Image creation uses Microsofts Volume Shadow Services (VSS), allowing you to create safe "hot images" even from drives currently in use.