you can use Amazon S3 account...
it's basically same as Dropbox but in "do it yourself" way...
You have program to access (upload and download) data, and you pay only for what you use... And you're safe if dropbox or evernote go out of business or get closed by FBI bcos Amazon is big player and serious company...
just my 2c
if you need any help setting this up
http://www.awmzone.com/services
PS:
Link with details and pricing at:
http://aws.amazon.com/s3/