JDE World - How to remove purged EDI in library

There are 2 programs which are P47018 and P47029 can able to purge EDI data.
On both of these programs, there is a processing option like below that determine whether or not to save the purge record.
Enter a '1' to save the purged records 1 to a special purge library. (Default of blanks will NOT save any purged records.)

For the existing purge libraries, the customer can choose to perform a backup and delete them.
For new purge libraries, the customer can decide whether or not these backup libraries are being created or not by the processing option..If the processing option is still being kept as 1, the customer is recommended to perform regular backup and deletion of these libraries to prevent the same situation that the harddisk space is full due to these libraries.