Backup On-Demand
Storage List
To perform an on-demand backup, go to the instances tab under the Storage Providers section.
You can click on the icon to back up a single storage instance
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Or select multiple instances and click on the icon to back them up.

Finally select the backup type, backup destination, when a task should start, the priority, and click on the backup button.

Note.
You can also perform the same action thanks to the CLI interface: CLI Reference.