You need to define and activate at least one storage device in Data Backup Settings to use the Data Backup tool
Data backup files can be written to a local folder or a Dropbox folder
To write backup files to your Dropbox you must first grant access to the WP Data Access Dropbox app (which does not yet have production status)
Exported SQL files can be imported into a WordPress database with a different table prefix. The WordPress table prefix is replaced during export by variable {wp_prefix}, which is replaced by the WordPress table prefix on import. If you want to use another tool for import, disable the checkbox “Export with variable WP prefix” in Back-End Settings on the Manage Plugin page. With “Export with variable WP prefix” disabled full table names will be written to the export file.