I began to slowly convert from a PC to a Mac Mini as my main desktop computer about a year ago. I have a late 2009 mini with a 320g hard drive. I am beginning to run out of hard drive space and I have never used Time Machine since my critical files are still on my PC. I want to convert completely to my Mac this year but I need some help with hard drive management. Do I need one external drive for Time Machine and another one (or more) for my other files beyond what is on the internal 320g drive? Do I need to connect all the external drives separately to the Mini or can they share a USB hub? Do external drives significantly reduce the Mini's performance? Would a USB hub reduce it even further? Does it make any sense to look at something like a Drobo? Can the multiple drives on the Drobo house both the Time Machine and other drives? Can a Drobo be used in a mixed environment on an ethernet network with Macs and PCs or do the drives have to be formatted for one or the other? Any suggestions as to how people manage their data and speed performance on their Mini would be appreciated. Thanks!