If you think Time Machine is backing up your Mac too often, you can customize the interval between two automatic scheduled backups. Use following command to change the Time Machine Backup Schedule.
sudo defaults write /System/Library/LaunchDaemons/com.apple.backupd-auto StartInterval -int XXXX
Change XXXX to some other time interval in seconds, for one hour: 3600, for two hours: 7200, …
Revert to defaults setting:
sudo defaults write /System/Library/LaunchDaemons/com.apple.backupd-auto StartInterval -int 3600