By default, Time Machine backs up your system every hour if you leave your backup drive plugged in. If you are creating a lot of new data, this is a great system as it allows you to be able to have a consistent backup of all your information.
However, If you don’t need to have data backed up that frequently, or if you want to change it to back up more often, it is possible to change the default frequency for backups with this simple Terminal command.
Sudo defaults write /System/Library/Launch Daemons/ com.apple.backupd-auto StartInterval -int 900
The number at the end of the command is how many seconds it will be until the next backup occurs. In the example, I used 900, which is 15 minutes. If you want to change to a backup interval of 2 hours, you would use the same code and change the number to 7200.