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Jul 2, 2015 9:25 AM in response to uworldsby Bob Timmons,How may I prevent my computer from making Time Capsule backups except only in the case where I have an external backup drive plugged into the machine?
Sorry, but this is not possible unless you make unsupported modifications to the operating system using Terminal commands....or turn off Time Machine.
Backups to your MacBook Pro are called "local snapshots". They are temporary, and will only occur when your Mac has plenty of space on its startup drive. Older local snapshots will be deleted automatically if less than 20% of the storage space on your Mac is available.
Is there a way to delete all backups which are only straight on the MBP and retain only the ones on the external drive?
Sorry, but no.
More info here: About Time Machine local snapshots - Apple Support