Time "Capsule" or "Machine" (or both)?
Not sure what you mean, here; I suspect one of is misunderstanding.
Time Capsule is an as-yet undelivered product consisting of an Airport Extreme Base Station with an internal hard disk drive.
Time Machine is a software application that can automatically make periodic snapshot backups to a connected hard drive or to the drive inside a Time Capsule.
You can choose what drive TM should use, and it can be the one in a TC.
TM can readily be controlled to make periodic backups, switch target drives, stop making backups, or make one immediately on command.
Is the answer to your question in there somewhere? If not, we can try again.
Tom