I use a Western Digital 'My Book' connected via firewire that I allow OS 10.5.2 to put to sleep. It appears to be as simple as my firewire drive will not wake up and allow the backup to proceed. In some cases, if you're backing up to an external USB or FireWire drive, simply powering the drive off then back on while the "Preparing Backup" message is displayed can force progress. On the other hand, if you are using VirusBarrier X5 (a much superior product in my opinion) you can simply add the volume on which Time Machine stores backups to the Trusted Zone." If you're using NAV then my understanding is that you need to turn off background checking.
"My experience is that in many of these cases the problem has to do with virus protection software working in the background at the same time that Time Machine is attempting a backup. Paul Calamai reports a similar occurence with Norton AntiVirus.
Once I disabled the auto-scan function before attaching my Time Machine hard drive, everything worked as expected." "I've had this problem but discovered that my ClamXav anti-virus sentry was set to scan any attached hard drive, USB, etc.
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