[ubuntu] Setting up my first server-Need Direction

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http://ubuntuforums.org – I have a few questions first, but let me explain my needs first. Easy stuff 1) I need a computer/server to act as a file server for 8 employees and myself. 2) I need to set up different folders for different projects and set up different permissions for the employees. 3) Time tracking 4) 4TB in raid 5 Harder stuff 4) VPN to the server 5) Zero down time The questions: 1) Hardware: Do I need server hardware or can I use a desktop hardware 2) Raid 5-Preferred?? SATA drives?? 3) I like using a GUI because I am not good at the command line, can I use regular Ubuntu or (Hardware)