What the actual fuck is wrong with you? It's 2017 and you STILL only have one copy of your data? Hard drives fail. Laptops get stolen. Houses burn down. Internet services close without warning. You need multiple copies, and you need them to happen automatically. Get yourself an external hard drive and set it up. Windows user? Try the built-in backup and restore or Genie Timeline. Mac user? Time Machine is built in. You will be safe and smug when your hard drive fails.
Bonus points: set up remote backups for your most important files with BackBlaze. External drives won't protect you against fires, theft, etc.