HELP - problems setting up External Hard Drive to Time machine

Hi
I set up Time Machine about a month ago. I had an additional 250GB USB External Hard Drive connected but it was not included in the back up. I think that at the time I had been told that I could add the files from the 250GB external to the back-up Time Machine disk later.
Also, before I set up Time Machine on the new 1TB USB drive, I partitioned the drive, and I think as I was deciding how to partition it, I used the Erase utility to reset the drive. I don't know if that is relevant.
Time Machine has been working fine with my internal drive - well I haven't needed to restore anything with it, so I don't really know.
However, I have tried to add the 250GB drive to Time Machine, and in Preferences->Options, the 250GB drive is greyed out in the 'Do no back up' list. And the - (minus) box is also greyed out so nothing happens when clicking on it.
I tried to sort this out a couple of weeks ago, and someone helpful on the forum advised me:
"to move the file /Library/Preferences/com.apple.TimeMachine.plist to the desktop. then go to system preferences->Time machine and set up time machine again. the exclusion list will be empty and you can add what you want to it. "
I tried this a number of times and each time I struggled to set it up again. When moving the .plist file I was always asked whether to keep or replace. I tried both, sometimes the file would come back into the folder, sometimes not.
The 250 GB drive was still on the list of 'Do Not Back Up the following drives". After one occasion recently on my attempts, the system did not recognize time machine.
I'm really stuck here - both my drives are ridiculously low in space.
Please help,
Thanks
Steve

What is it you are trying to do? Do you want to change the backup drive from the one you have been using to another drive? That's all you can do. If you have a drive set up as the TM backup drive, you cannot designate another drive as the backup drive unless you disable the existing backup drive. TM cannot backup to more than one drive at a time, and TM cannot span backups across multiple drives.
To move any device out of the Exclude list simply select it then click on the [-] button to remove it from the list.
To prepare a new drive as the backup drive you must partition the drive GUID or APM depending upon whether your computer is Intel or PPC, respectively, and the formatted Mac OS Extended (Journaled.) See the following:
Extended Hard Drive Preparation
1. Open Disk Utility in your Utilities folder. If you need to reformat your startup volume, then you must boot from your OS X Installer Disc. After the installer loads select your language and click on the Continue button. When the menu bar appears select Disk Utility from the Installer menu (Utilities menu for Tiger or Leopard.)
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Note the SMART status of the drive in DU's status area. If it does not say "Verified" then the drive is failing or has failed and will need replacing. SMART info will not be reported on external drives. Otherwise, click on the Partition tab in the DU main window.
3. Set the number of partitions from the dropdown menu (use 1 partition unless you wish to make more.) Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID (only required for Intel Macs) then click on the OK button. Click on the Partition button and wait until the volume(s) mount on the Desktop.
4. Select the volume you just created (this is the sub-entry under the drive entry) from the left side list. Click on the Erase tab in the DU main window.
5. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, check the button for Zero Data and click on OK to return to the Erase window.
6. Click on the Erase button. The format process can take up to several hours depending upon the drive size.
Steps 4-6 are optional but should be used on a drive that has never been formatted before, if the format type is not Mac OS Extended, if the partition scheme has been changed, or if a different operating system (not OS X) has been installed on the drive.

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