Apple does let you buy additional storage beyond 200GB, all the way to 1TB (Apple hasn't yet announced pricing beyond 200GB, however).
Yeah but I want multiple terabytes!
Apple does let you buy additional storage beyond 200GB, all the way to 1TB (Apple hasn't yet announced pricing beyond 200GB, however).
The main problem with solutions other than Dropbox and iCloud (e.g., Box, Copy.com,Evernote, Google Drive, Microsoft Cloud Drive) is lackluster support from 3rd party iOS apps. To me, it really doesn't matter how much storage these cloud services offer if apps that I prefer to use don't support them.
Having said that, it is very clear that Dropbox's pricing is dramatically higher than its peers. Dropbox's CEO commented last week at Re/code that won't be cutting price nor increase storage capacity, which sounds like a big gamble.
The answer is no you can't backup iPhoto with Dropbox and multiple computers.
You can use a Dropbox folder to hold your iPhoto container (file) but what is the point? No other computer can use it without corrupting it.
The problem isn't Dropbox but the way Apple implements containers.
So technically, you can backup ONE iPhoto container to Dropbox. However, it real world use you can't.