Snapshots allow to retrieve files in your live instance for backup purpose. Once created, a URL is provided so that you can download the archive. Snapshots expire after a certain interval (hours) and so you need to take care to backup them.
The snapshot feature is available in the administration, under Access > Snapshots, which is the most convenient to manage snapshots.
The following command can be used to create a snapshot:
openode create-snapshot <path>