Time Machine falsely says my disk volume is too small

I have several Fusion VMs which I am excluding from TM backup. But when I select "Change Disk..." in TM, it tells me that the disk I wish to use is too small. When, in fact, it is about 4 times larger than the data I wish to back up. It seems to be using the entire contents of my main volume (including the excluded Fusion VMs) when calculating the required size of the new TM target disk. Is this a TM bug? Is there a work around?

This thread might be of interest:
http://discussions.apple.com/thread.jspa?messageID=8002977&#8002977

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    Open the folder labeled “Backups,backupdb”.
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    Cheers!

  • Time Machine Backups of External Disk are Missing

    I have followed the troubleshooting tips at http://pondini.org/TM/E3.html.
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    While in Time Machine, to see all mounted volumes shift - command - c.    Information learned from Linc Davis.

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