@fredcasey,
Well there are many of them out there.
I prefer Drive for my cell phone back up. I s a service provided by google and i can access from any computer when i am in need. It offers a modest 15 gb for starts.
To share information i use Dropbox, it has a limited 2 gb from start but they inmediatedly start augementing your uploading capacity. It is useful since it works cross plataforms, can share a document with someone that uses ios.
Now to share archives openly in the net Mega is your option. It is also free has a good capacity and every time you upload something it generates an adress so you can post it on a blog for any one to download it.
There are other options as 4shared, but i like it more as an archive browser.
Hope this is useful.