a specific point in time. RollBack Rx - Allows snapshots of disk partitions to be taken. Each snapshot contains only the differences between previous snapshots, and take only seconds to create. Can be reliably used to keep a Windows OS stable and/or protected from malware. GoBack (discontinued) - The GoBack software for Windows from Symantec enables reversion of files, directories or disks to previous states. It can record a maximum of 8GB in changes, and temporarily stops recording each change in the event of high I/O activity. Versomatic - Versomatic software by Acertant automatically tracks file changes and preemptively archives a copy of a file before it is modified. Cascade File System exposes a Subversion or Perforce repository via a file system driver. The user must still explicitly decide when to commit changes. git implementation documents call git a "content addressable filesystem with a VCS user interface written on top of it." There's also a 3rd-party FUSE implementation exists that may extend git as a mountable, read-write versioning filesystem. See also Backup Comparison of version-control software Copy-on-write Object storage References External links Computer file systems