How do I backup with TimeMachine to my External Hard Drive through iCloud?

I have connected my external hard drive to my iMac and it has Back to My Mac through iCloud enabled.  On my Laptop I have been able to access the iMac through the shared computer section of the Finder and then mount the external hard drive to my machine.  In Time Machine preferences I have selected the disk that I mounted and it shows me the name in black and below it iMac in grey.  However when it goes to back up it gets an error and says the Backup disk is not available.  What do I need to do to make the disk available?
Thanks!

Two ideas.
1) You need to drag the little icon next to the Event in the Event Library List (on the left) to the litlle icon for the drive in the event library list.  Do not drag anything from the main Event Pane.
You should also know that a simple drag and drop will copy the Event to your external drive. If you hold down the Command Key while you drag, it will be a Move rather than a copy. If your goal is to save space, use Move.
2)
The external drive must be formatted as Mac OS Extended (journaled). Also known as HFS+.
FAT32 drives will not work. NTFS drives will not work.
If you right-click on the drive in the Finder and "Get Info", you should be able to tell how the drive is formatted.
You can reformat if necessary using Disk Utility, but this will erase anything that is currently on the drive.
If the formatting appears to be correct, report back and maybe we can think of other things to try.

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