With you on that. Keepers don't need resting unless carrying injuries. backup keepers are a different breed, they know when they sign for a club that they'll be backup and won't play unless there's an injury to the number 1, they've accepted that and are willing to spend a career sat on the bench, therefore i don't see a need to keep the backup happy by giving them cup games. When it gets to the business end of any competition you always play your best team, the keeper situation shouldn't be any different. If you've got two keepers of similar quality like Barca for example than that's understandable, we don't.