I have several fixed hard drives in my PC as well as several external USB drives. Sometimes I want to take one of the externals to a friend's place, but the data I want to take along is on one of the fixed drives. I'd like a utility that will allow me to select one or more folders' worth of data on the external, then select a similar volume of data on the fixed HD, and will then basically cycle each of the selections to the opposite drive. The end result would be that the data I want to take along (TV show episodes, for example) is now on the external and ready to disconnect and take with me.
The stricture that makes this type of utility very necessary for me is that I often have very little free space on my drives, so doing the copying manually can be quite complicated and time-consuming. It might be plausible to create a RAM-cache for the copy so that minimal drive space doesn't prevent the copying from working...
I hope I'm being clear as to what I'm looking for. Of course, if such a utility exists already I'd love to hear about it!
Thanks, as always, in advance!