One of the great things about the Raspberry Pi is the minuscule amount of electricity it needs to run. This means you can leave it on 24 hours a day without worrying about your electricity bill (or bigger things, like climate change). And when you have it on all the time, you can have the Pi take care of important jobs. One example of this is backing up your email with a Raspberry Pi. For a great guide on using a Pi and getmail to backup your email, checkout this link: How to Back Up Email with Getmail at Magna Techa.