Two Machines backing up to one sparse bundle

My wife recently migrated from a MacBook to a MacBook Pro. She was using TM to backup to Time Capsule. We set up a new user account on the old MacBook for my daughter and changed the computer name in sharing preferences on BOTH machines to initiate brand new backups for each. MacBook Pro was initially backed up to a new volume, but then switched back to backing up to the original sparse bundle. The MacBook is also backing up to the same bundle although both machines have different names. What's going on and how do I fix it? My gut tells me to start over by restarting TC and deleting old sparse bundles before backing up each machine. Any suggestions?

TM does not go by computer names when you are doing TM backups. it tags the sparse bundle with the MAC address of the computer which is a unique identifier. but in Snow leopard TM also lets you continue using an old sparse bundle when you use Migration Assistant to migrate to a new one. I guess that's what happened to you. I think the only way out at this point is to delete the sparse bundle where both computers are backing up now. you can simply trash it and empty trash or you can wipe the TC drive as you were intending this will of course delete it too. I would also reset TM preferences on both computers. after deleting the sparse bundle delete the file /library/preferences/com.apple.timemachine.plist. then go to TM system preferences and set up TM. do it on both computers.

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    Steve Lewis wrote:
    >
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    Apple networking is annoying, but then on the other, it's easy. We lose printing in a similar way.
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