Archiving data can save you in a pinch—but what if you forget to make a backup? This Raspberry Pi project, created by Curtis Gross, solves that problem by automating the process in a convenient NAS device. The end result is a Pi-powered time machine server with all of your data stored in archives.
One of the most popular ways to back up data is with an NAS. However, there are many other reasons why a network storage device may be a good idea.
Source: 3 Great NAS Solutions for Linux (Make Tech Easier)
OpenMediaVault is a Debian based special purpose Linux Distribution to build a Network Attached Storage (NAS) System. It provides an easy to use web-based interface, Multilanguage support, Volume Management, Monitoring and a plugin system to extend it with LDAP, Bittorrent, and iSCSI capabilities. This tutorial describes the installation and configuration of OpenMediaVault.
Source: Build your own NAS with OpenMediaVault – Howtoforge