The tablespace is used for storing the actual data underlying database objects. you can choose whether to back up the tablespaces.
Don't backup any Tablespaces: The software will not back up any tablespaces on the MySQL server.
Backup All of Tablespaces : The software will back up all of the tablespaces on the MySQL server.
Backup Tablespaces for selected databases and tables : The software only backs up the tablespaces for the selected databases and tables on the MySQL server.