Back it up Online storage is extremely cheap and it can be safe enough as long as you are careful. For the cost of a coffee at a barista shop you can have about 200 GB storage space in iCloud or Google 1.
Physical protection Get a good case. One that will protect your screen. Create good habits to carry and store your device to prevent damage by drops on hard surfaces and bodies of water.
Battery care For extended battery life, use smart chargers. These are also known as 'Green' chargers. Once the charging unit determines that your mobile device's battery has been fully charged, power is shut off.