I am setting up a time machine backup to a external Hard drive.  I want to backup by Mac book Pro running OSX 10.8.5. I would like to Partition the disk and use one partition for Time machine backups and the other for my Lightroom backups. How to do this?

I want to create a two partition disk. One partition for time machine, the other for Lightroom backup. Currently Time Machine is using the entire drive and it is doing the intial encryption and is about 29% complete after two days.  I've decided that I want to turn encryption off and partition the disk. So I do I start over?

With the external drive attached, open Finder>Applications>Utilities>Disk Utility.  Select the external drive from the list in the left side panel of the DU window.  In the main window panel, click Partition in the buttons top center of that panel.
Select the number of partitions you want and adjust their sizes.
For the first partition, click to highlight the partition, then select the format, Mac OS Extended (Journaled) and then the partition table as GUID [both of those are the defaults].  Click Apply and it will ask to confirm and erase and format that partion...oh, give the partition a name, like Backup. 
Then repeat those steps for the second partition..and remember to name it...something like Lightroom.
Close Disk Utilitty and you are ready to send TM to the one partition, and do your backup of Lightroom to the second partition.

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