Change the frequency of Time Capsule backup by editing the following le with your text editor of choice
And looking for the section
The value 3600 specifies the backup interval in seconds (i.e. 1 hour). Change this value to whatever you see fit – I have changed it to 14400 (or 4 hours).
Needless to say, proceed with caution when editing you Mac’s system settings, and if you do mess up it’s nothing to do with me, right?