How do I minimize the backups stored on my Macbook Air?

I'm using Time Machine onto an external hard drive, but there is more than 60GB of 'backups' in my MBA's internal storage. How do I minimize or remove that? I'll plug my Lacie external in everyday and utilize Time Machine... Any thoughts?

OS X Lion- About Time Machine's "local snapshots" on portable Macs
Open the Terminal in the Utilities folder and enter or paste the appropriate command line. Press RETURN and enter your admin password when prompted. It will not be echoed.
To turn them ON: sudo tmutil enablelocal
To turn them OFF: sudo tmutil disablelocal
Note that turning them OFF will also delete all existing snapshots.

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sudo tmutil disablelocal
Press return. You will be prompted for your password, it will be invisible.
To undo this, rerun it with "enablelocal" instead of "disablelocal".
In TM preferences you can choose to exclude items to the backup.
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How do I minimize the backups stored on my Macbook Air?

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