On your iPad or iPhone you can turn on iCloud backup (via Settings > [your name], and tap iCloud > tap iCloud Backup > ON)

If you are using iOS10.2 or earlier, (go to Settings > iCloud > Storage & Backup > iCloud Backup > ON) or in iTunes if you have select "Backup to the iCloud". Once this is done your device will automatically backup your PIM data (as well as all your other apps data and photos etc) daily over Wi-Fi when your device is connected to a power source. Once you plug it in, everything is backed up quickly and efficiently. This way if your iPad or iPhone is ever stolen, lost or the PIM app is accidentally wiped, your device can be easily restored easily and quickly. 

More information about this feature can be obtained from Apple Support/iCloud Overview

Detailed instructions for the iCloud or iTunes Backup/Restore process can be found here  iCloud or iTunes Backup and here  iCloud/iTunes Restore

Pricing for iCloud starts at AUD$1.49 per month (which includes 50GB, per iCloud ID) as of November 2017.  For other pricing plans refer to this direct link from Apple - Pricing