Boot Camp & External HardDrive

Is it possible to use Boot Camp to create a Windows partition on an external hard drive that is formated for Mac so the same drive can be used to back up both the Mac partition and the Windows partition?  Would do this using the backup feature in Lion and a backup software program under Win7 Pro.
iMac 27" Intel i5 2.7GHz Late Model
16GB RAM
OSX Lion
Windows 7 Professional
The internal HDD has been partitioned using Boot Camp and am currently using both Win7 Pro and Lion on the same machine.

OK. Gotcha.
The easy solution is to partition the drive using GUID and formatting using exFAT on the Windows/Mac partition and formatting for OS X on the Mac-only partition. Do this using Disk Utility.
Drive Preparation
1.  Open Disk Utility in your Utilities folder.
2. After DU loads select your hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to two. Size each to your preference. Set the format type to Mac OS Extended (Journaled.) Click on the Options button, set the partition scheme to GUID then click on the OK button. Click on the Partition button and wait until the process has completed.
4. Select the partition you will use on both Windows and Mac, click on the Erase tab in the DU main window. Set the Format type to exFAT, then click on the Erase button.

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