Detailed instructions for Dropbox login. Dropbox is an internet service launched in 2007 that stores data from a PC or smartphone on a remote computer system. Dropbox stores these files in the cloud using Amazon services. Once you upload a file to Dropbox, you can retrieve it from any computer connected to the Internet. The system serves as online data backup, but also to exchange data between different people. Access to dropbox is possible in the browser and using applications (apps) for various operating systems.