Go to the BPS Pro > Tools > DB Table Cleaner|Remover tool > Select the Drop Radio button for this database table xxxx_bpspro_arq_quarantine. Click the Empty|Drop button to delete the quarantine database table. A new blank Quarantine database table will automatically be created.
Then use FTP or your web host control panel file manager tool and delete all the folders that are under the quarantine folder: /wp-content/bps-backup/quarantine/