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I think the issue is not so much which devices you own *now* but rather which you might in the future. For example if my current computer dies, how easy will it be to get my content onto the new one? If doing so is reliant on me using a web server somewhere, can I be assured that web server will still be there? Or that I will happen to have internet connectivity when I need to do it? For example I often use some of my ebooks at work, and I use my own personal computer at times. I cannot connect it to the internet at work. So if I needed to access my files and had to reauthorize a new computer while I was at work, I couldn't do it.
It's not so much whether I have three or five or whatever devices *now* it's if I get a new device and want to transfer over my stuff.
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