A lot of us use Dropbox to securely store files online for easy access, especially when using multiple devices. Do any of your files need to be encrypted for even better securityt? http://www.axantum.com/axcrypt/ is free. AxCrypt is the leading open source file encryption software for Windows. It integrates seamlessly with Windows to compress, encrypt, decrypt, store, send and work with individual files.
Encrypt the file first, then move to Dropbox.