The best way to ensure that most of the data on your iPad is safe and backed up is to set your iPad to be backed up to iCloud.
Please follow the directions below to enable iCloud backup:
When you iPad is connected to a Wi-Fi network, connected to a power source, and your screen is locked, the iPad will backup automatically. These conditions happen mainly a night when you plug you iPad in to charge.
You can also reference Apple's knowledge base article at the link below for additional instructions on how to backup your iPad to iCloud: