If you are not using Time Machine you should. It so easy to use and simple to set up. Anyway I have found that my Time Machine could backup more frequently. The default time is one hour. In an hour I can create change and delete a lot of file that wouldn’t be backed up. You can change the backup time value and it is easy to do. There are two ways to do this, through Terminal or the good old manual way. They do the same thing.
If you want to do it the manual way navigate to
System/Libary/LaunchDaemons from here find com.apple.backup-auto.plist. This is the time machine backup file. Open this in text edit and find StartInterval there is a number in the integer value. The default for this is 3600. This is the value you change.
If you want to change it to 30 minutes backup change the value to 1800. To work out when you want it to update times 60 (seconds) by the number of minutes you want it to backup. Don’t enter it to low otherwise you could slow your system right down.
If you want to use the terminal more automatic way open up terminal.app and enter the following.
sudo defaults write /System/Library/LaunchDaemons/com.apple.backupd-auto StartInterval -int 1800
It does the same thing except it is easier to do and you don’t need to be editing files directly.