Frustratingly for Raspberry Pi users, there is no Dropbox client available. While you can access the popular cloud storage solution via the Chromium browser (and alternatives are available) a handy command line script might just come to your rescue.
Created by Andrea Fabrizi, this can be installed via the Terminal (or remotely via SSH) with:

git clone https://github.com/andreafabrizi/Dropbox-Uploader.git
Once the GIT file has downloaded, make the script executable and run it:
cd Dropbox-Uploader
sudo chmod +x dropbox_uploader.sh
sudo ./dropbox_uploader.sh
You’ll then be prompted to enter a unique key. This is where things get a little complicated.

- Visit www.dropbox.com/developers and log in with your Dropbox account.
- Click Create your app, select Dropbox API, and Full Dropbox, then give the app a unique name (“pi-sync” preceded by your initials, for example) and agree to the Terms and Conditions.
- Click Create app to proceed, then copy the App key and App secret strings.
- Copy the key into the Terminal window where prompted, and you’ll be able to upload your files to Dropbox.
Use commands formatted like this:
sudo ./dropbox_uploader.sh upload /home/pi/screenplay.odt /docs/screenplay.odt
To summarize, this command calls the Dropbox Uploader script, uses the “upload” command, and syncs the screenplay.odt from its location on the Pi to a new location in the “docs” directory in Dropbox.