Box is a cloud storage, syncing, sharing and collaboration system designed for business use. It is well maintained and has excellent support staff. BUT:
Box requires Windows naming for all files it backs up to the cloud. OUCH!!! That means no use of Windows reserved characters. That means THESE characters are off limits:
/ \ ? % * : | " < > . and the Space character. No spaces!
Box also has not-a-clue what a UNIX/OS X package file is and will NOT back them up. Got that? NOT back them up. That kills off a slew of files on any Mac including all apps, plugins, sparse bundle disk images, blahblahblah. Obviously, their servers are 100% Windows, NOT Mac friendly in the least. NOT MAC FRIENDLY.
BUT: Box is fine for text files and other simple data formats, as long as you're willing to deal with the Windows naming character restrictions. I dealt with it! So I use Box.
I also use Box thanks to some good timing, craftiness and nice offers from Box whereby I snagged 50 GB of space. (Not a typo!) So I figured I might as well use it. As a research obsessive, I have GBs worth of collected information files. There's nothing private in the collection. Therefore, I let Box back them up and sync them to my other Mac.
Box very nicely suggests new names for your files that violate the stupid Windows naming restrictions. BUT! I went into SHOCK when I first let Box at my files because it FLOODED me with renaming suggestions. I have a lot of files. It took an hour to click through the renaming, not-a-joke. And lord help you if you attempt to stop that process! Don't stop it! Don't! Going back to force renaming is a horrorshow. It can be done but is an even more shocking PITA.
Once you get the names straight, the backup and syncing work fine. I like being able to access exactly the same files on two computers across my network via the cloud backup. It also lets you send URLs to associates where they can access whatever you choose to make public. There are a few other bells and whistles to read about at their website.
There is NO encryption, just to warn you. This is NOT a service for PRIVACY. Therefore, this is yet another restriction when using Box. Be prepared.
I like Box a lot, for what it is. It is a well run service. But if you don't want to deal with all the idiotic Windows naming and flat file restrictions and lack of encryption, go ELSEWHERE!
The two best Mac-friendly, privacy maintaining, illegal-surveillance-proof, client-side encrypted cloud services I know of are Arq and SpiderOak. But they have their quirks as well. Therefore, homework required.