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Box, no relative to Dropbox, is far more than just a simple cloud storage service. It's also a business-collaboration and work-flow service. In particular, its native Windows Phone and Windows 8.x apps Office integration lets you open, save, and share files from the cloud without having to leave the Office programs. Windows and Office users might find Box attractive... except Microsoft has its own outstanding small-scale cloud storage service: OneDrive.
Box starts at its Personal tier with 10GBs of storage and a 250MB file size limit. You can move this up to 100GBs of overall storage for $5 per month. Where Box really starts to shine for SMBs is at the Starter Level. Here you get 100GBs of storage for one to ten users at $5 per user per month. Besides simple storage you can lock files, set them to automatically expire, assign permissions to them, and keep up to 25 previous versions stored. Above that, the Business tier, for $15 a month with a minimum of three users gives each user a terabyte of storage, up to 50 file versions and audit logging, external authentication, and user management. All these versions also give you access to a wide variety of useful business apps: OneCloud.
Last, but not least, Box supports a wide-variety of operating system. There is not, I am sorry to say, a native client for Linux.
Dropbox is no frills cloud storage, but it works really well and it's really fast. Put it all together and that's been enough to make it the most popular personal cloud storage service of all. What I've already really liked about Dropbox is that I can use it just like it was any other network drive, with pretty much any file manager on any operating system. For example, in the screenshot above you're seeing Dropbox on Linux Mint with the Cinnamon desktop interface.
Dropbox's free version offers only 2GBs of storage. The Pro version will enable you to go up to 500GBs of storage for $499 per year. If you have a SMB, what you'll really want is Dropbox for Business. This runs $15 a month per user and an annual pricing of $485 and $125 a user a year after the first 5 users. The nice thing about this top price tier is that each account get unlimited storage.
Google Drive takes the tried and true Google Docs cloud-based office software and adds simple, easy to use file storage to it. Like Dropbox, it integrates with Windows and Mac file systems. I'm sorry — and annoyed — to report that, despite years of promises, Google Drive still doesn't support Linux. Enough already Google! Google Drive does, however, support Chrome OS, Android, and iOS.
Another nice feature is that Google Drive enables you to share and collaborate on any kind of file, including documents, music, images, and videos. In addition, Any content you create in Google Docs doesn't count against your storage quota.
Speaking of storage, Google Drive comes with 15GB of free storage. This storage space is also used for your Google+ Photos and Gmail.