bpimage -cleanup -allclients
"...
-cleanup This command deletes expired images, compresses
the images that are scheduled to be compressed,
and prunes the TIR information from the specified
images.
Note This command enables a user to accomplish
the same tasks manually that the scheduler
performs on a regular basis. It can be used
when the user does not have enough time to
wait for the scheduler to perform these
tasks.
..."
prior to the bpexpdate command.
The cleanup interval here can be set via the GUI NetBackup Management > Host Properties > Master Servers >
Master Server > Image Cleanup