If you are running jobs defined as Append, to an Appendable Media set, eventually the media will fill up with non-overrwriteable data, since the OPP is reset each time an Append Job finishes.
If you are doing this to disk, you will fill your disk with non-overwriteable BKF files, since all media in an append "family" share the same OPP, which, again, is reset each time a job finishes