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OpenMediaVault (OMV) is a free Linux distribution designed for Network-Attached Storage (NAS). The project's lead developer is Volker Theile, who instituted it in 2009. OMV is based on the Debian operating system, and is licensed through the GNU General Public License v3.
DietPi is extremely lightweight operating system, start at 400MB in size (3x lighter than 'Raspbian Lite'). With features of low process/memory footprint and DietPi-RAMlog installed by default,
DietPi allows you to get the maximum performance from your device.