calculator

What do you guys use for calculating storage capacity requirements? I'm looking at storing the output of 60 cameras, H.264, 20fps, 7/24 recording, 60 days retention, 720p(1MP). This is a storage capacity only situation, I'd love to be able to size it within 10TB of what's needed if at all...

not sure if this has been posted, did a search with no results. handy calculator for bandwidth and storage. a good read here too...pdf format on... NVR Camera Capacity based on Bit Rate from hikvision http://www.stardot.com/bandwidth-and-storage-calculator image quality and coverage...