More and more people are living their digital lives entirely out of their mobile devices, but the convenience of keeping your data with you may also be keeping all of your eggs in one basket.
Each mobile device is unique and the information you keep on a device is often just as unique as the files and documents you might keep on a computer. So like a computer, you should always take steps to preserve and backup any of the important information you save on your mobile devices.
Backing up everything on iOS devices can be as easy as making a full device backup using iCloud or iTunes on your computer. For Android, connecting your device to the computer can let you pick and choose the important data you’d like to copy as a backup.
No matter what type of device you’re using, it’s very important to make sure you are in control of your system. A reputable anti-virus application can be a good thing to add to your device, but as with any apps you install, your own research and caution is the best defense against malware.
Being in control of your system is even more imperative if you plan on using any kind of memory/file cleaning app for your mobile devices. Because “cleanup” type apps are specifically designed to delete information, they should be used with caution. If possible, set cleaner apps to ignore your most used programs and always double-check the information that the cleaner wants to delete before allowing it to clean. For example, when using Clean Master on Android, select eWallet from the initial scan list and select press "Add to Ignore List" to tell Clean Master not remove any of your eWallet data. (And of course select any other apps that have data you don't want deleted).
Source: Protecting your information blog post