PUBLIC MARKS with tags snapshot & linux

A virtual machine snapshot is a great feature, freezing the current state of a virtual machine. Unfortunately, open source Xen doesn't offer support for snapshots -- but Linux does. Since open source Xen always uses Linux as its privileged domain, you can use Linux commands to create snapshots.

Timevault est un programme pour Gnome sous Linux qui est encore en phase beta qui permet de faire des sauvegardes automatiques de ses fichiers ou de son système sous forme de Snapshot comme la Time Machine sous Mac ou le machin de restauration de Windows.

This document describes a method for generating automatic rotating "snapshot"-style backups on a Unix-based system, with specific examples drawn from the author's GNU/Linux experience. Snapshot backups are a feature of some high-end industrial file servers; they create the illusion of multiple, full backups per day without the space or processing overhead. All of the snapshots are read-only, and are accessible directly by users as special system directories. It is often possible to store several hours, days, and even weeks' worth of snapshots with slightly more than 2x storage. This method, while not as space-efficient as some of the proprietary technologies (which, using special copy-on-write filesystems, can operate on slightly more than 1x storage), makes use of only standard file utilities and the common rsync program, which is installed by default on most Linux distributions. Properly configured, the method can also protect against hard disk failure, root compromises, or even back up a network of heterogeneous desktops automatically.