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Too many users abused unlimited Dropbox plans, so they’re getting limits
(arstechnica.com)
This is a most excellent place for technology news and articles.
You make excellent points. I think the key difference for me when I got the NAS was that I wasn't replacing an existing system. That and I actually enjoy playing with storage and networking, so I'm able to cover most of those bases you mentioned myself.
For the power issues, you may want to look into getting a UPS (Uninterruptible Power Supply) for anything you want to stay powered. Larger ones can get pretty expensive, but you can usually find some smaller ones for a decent price that I think would be fine for small business use. I've used and had good experience with UPSs made by APC.
I do have a UPS for some of my stuff. I was planning on getting another small one for some networking stuff, but no reason I couldn't get a bigger one to cover another device.