Graphical interface is probably a must have for me. I will be using this to store about 2TB of info (pdfs, videos, pics). I imagine that would be a pain to sort through without a GUI.
Are you planning on having it "off the grid" for a long time but might need packages you did not initially install? You can have that on other external media and setup your repo's to use it (like Flash Drives or DVD's/BluRay/etc). That would also be a factor. You will only get a "snapshot in time" for those repos but its something to consider.
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