Data domain ddboost Brtools retention policy

hello,

my customer use DDboost for backup SAP farm, using BRtools for backup and not RMANTools.

i have the problem with old version of backup, the brtools don't delete the old file and my data domain have file system full.

i look the sap file script and i  have this configuration

# expiration period in days for backup volumes

# default: 30

expir_period = 30

and UTL file this configuration:

# #############################################################################

#  OPTIONAL PARAMETERS (BACKUP ONLY)

# #############################################################################

SAVESETS = 6

# GROUP_BY_FS =

# ARCH_LOGS_SEQUENTIAL =

# RAW_DIR =

# RAW_DEVICE_SKIP_BYTES =

what parameter which allows me to have a retention of 30 days?

regards,

Mattia