I am having issues with my external hard drives since installing Mountain Lion

I am unable to get my time machine to backup consistently on my external hard drives since installing Mountain Lion. One of my drives seems to have lost all data since installing Mountain Lion. Is this problem cropping up with other folks? BTW, all of my drives are Lacie brand.

Marzomo wrote:
One of my drives seems to have lost all data since installing Mountain Lion.
Do you mean, when you select it to be used for backups, the Preferences window shows "none"?  If so, that's not a problem.  That doesn't get updated until the next backup to that disk is finished. See #B3 in Time Machine - Troubleshooting

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