Being able to back up data to the cloud is very useful. It means that even if your Raspberry Pi dies or your SD card gets corrupted, your data is still safe. It also means that you can access your data from any where in the world.
If you have a Google drive account, you can use the grive program to sync a folder on your Pi with your Google drive.
Full article here:
Back up your Pi to your Google drive (Raspberry Web Server)