Having a back up of your information is always a good thing - especially when that information is not only your organizations, but also that of your constituents. These backups can save time, effort, stress, and money in the event of data loss. Nimble AMS will back up data such as Custom Metadata and Unmanaged Code on a nightly basis, but with Salesforce, you can back up your entire organizations on a regular basis through their Data Export Process (external).
Learn more about Salesforce's Data Backup & Recovery Best Practices (external)
The data export process will only function for active Production Environments. If someone attempts to back up a Sandbox or Development organization, this will appear as though the process is going to complete, but will never begin or back up data.