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Time machine on Lion crashes the whole system when used with external HD

Update:11-30Source: network consolidation
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Hi all,
Anybody got the same problem? I did a Time Machine backup just before I did the upgrade to Lion (using an external USB HDD) after the upgrade (that went well in my opinion) when I ask TM to do another backup it stays on "Preparing" indefenately and ultimately crashes the whole system ( reset with ctrl+cmd+power button) is required otherwhise the system stays non reactive.
Regards,
Iwan

The Best Answer

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Start by verifying your internal HD, and repair your backups, per #6 in Using Disk Utility.
If that doesn't help, see #D6 in Time Machine - Troubleshooting for a possible way to cancel the backup.  If that works, use the widget in #A1 there to display the backup messages from your logs.  Locate the backup in question, then copy and post all the messages here.