What to do about all the extra copies?

[n9hmg]

I have set up the extra management classes in my RMAN domain, put the "TDPO_MGMT_CLASS_[234]" entries into the tdpo.opt files, and am waiting for my DBAs to set BACKUP_TAPE_IO_SLAVES to true and restart, and I'm going to have roughly twice as much RMAN data coming from a small selection of my nodes. Like everyone else, I'm getting "Save every version of everything forever" along with "Why do you need so many tapes?". So, I would like to do something about the extra copies. Does anyone have a trick for dumping the extras? Is it perhaps a feature of tdposync(it should be)?

It's worth the extra space taken up, in order to quit having our crappy WAN waste big backups, but if I can make the process more efficient, I'd like that.