Some popular cloud backup programs include Carbonite, Backblaze, Mozy, SOS, CrashPlan and OpenDrive. The features offered by these and other online backup services vary depending on both the service and plan a user signs up for. Some backup programs offer backups for Windows, Mac, iOS, Android, Windows Phone and Linux devices, while others offer backups for a more limited selection of devices.
Online cloud backup services operate by running a small application on a user's computer that monitors specific files or folders for changes. If a file is created in a monitored area, the program uploads a copy of that file to an online repository, where it is held for safekeeping. These files are generally accessible from anywhere and may be viewed or downloaded with nothing more than a Web browser.
Some services offer advanced backup services that create multiple copies of a file every time a change occurs, providing multiple versions of a file if needed. Other advanced options offered include folder synchronization, scheduled backups and full disk backups. Some risks associated with cloud backup services include losing access to files if a subscription runs out without renewal and the possibility of malicious attackers breaking into the online service and stealing files from users.