I have an iMac 2013 running OSX 10.9.4. I want to use Carbon Copy Cloner to backup user files to an external hard drive. Then I want to remove iPhoto libraries from iMac. What will happen to the iPhoto libraries that I back up when I run backup in a

I have an iMac 2013 running OSX 10.9.4. I want to use Carbon Copy Cloner to backup user files to an external hard drive to free up space on my iMack Hard drive.
So, say I make the backup today, delete iphoto libraries from my iMac, and then backup my iMac in a week. What happens to the iphoto libraries that are on the external backup drive now that I am backing up the iMac where they no longer exist?
I will have them backed up to a separate second external drive as well.
I'm just very cautious about removing them from the hard drive.
Thanks for helping and understanding my crazy caution!

I'd like to store my Aperture /IMovie Libraries on an external hard drive.
That is fine and recommended.. use the fastest disk you can afford.. ie Thunderbolt>USB3>FW800>USB2.
In addition, I'd like to partition the external hard drive so that Time Machine can use it to both back up my IMac and the external library drives.
Let me be clear.. you want to partition the one disk.. use it for TM and move your files to the external disk.. and then backup to the same disk.. You can do it.. but that is not a backup.. that is an experiment in how long you can get away with running files and backups on the same disk before you lose everything.. like Russian Roulette.. pull the trigger enough times and laws of probability will do you in.
You must have backups on a different disk .. otherwise it is pointless.
Can I set up a RAID 5 format for redundancy?
No.. you can buy special USB and Thunderbolt external drives that support RAID..
BUT that is still not a backup.. let me show why.. you make a silly move and corrupt your file in aperture.. it is not that rare.
Raid will corrupt all copies of the files.. it is replicated across all disks.
Delete a photo it is deleted across all disks.. you have no recovery.
Alway, always consider RAID system one disk.. backup onto another disk.. and if the photos or movies are at all important to you.. ie your family .. make another copy and store in a relatives house.. There is no such thing as too much redundancy.

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