As far as I can understand, the act of caching something is moving something from a slower memory (e.g. RAM) to a faster memory (e.g. Cache), when you want to access that thing a lot of times.
What if there is something in a faster memory (e.g. RAM), but you want to store it on a slower memory (e.g. Hard Disk) because you aren't using it a lot?
Is there a word for that action? Just "storing" doesn't seem right. Couldn't find a better word on Google, just by describing my problem.