I've used those and work great.
I think I've experienced getting more space drop Dropbox on the free version like 2gig I think, the more you refer, or invite people to share folders, they add on more space so I have more.
I've even considered using dropbox as a backup storage space location. $10.00 per month, I checked others and the space and cost is all about the same. Actually, I should just get another 2 tb external.
I need to back up about 600gigs right now off of my external drive. I just re connected it again this am and it almost didn't load and tells me it's on it's last leg. I had that external 1tB for about 6 years and it's been good to me since I take it with me when traveling and plug/unplug about 4-5 times a week. That in sure wares it down and I would assume potentially bad for it, causing its eventual demise. With that said, does anyone know if it's supposed to be ok to just unplug and plug? I don't seem to have an option to eject like you do a jump drive or CD.