You have several options to backup or export your data from Bkper.
Extract your data to a Google Sheet, using the Bkper add-on.
1) Open the add-on.
2) Select your book and query and combination of data to extract
Press fetch (blue button) and Bkper data will be written from the active cell on.
Note: The add-on auto update fetches the data every hour for you, ideal for automated backups.
Export your data to a CSV file with the content according to a query.