Bitcoin is secure as possessing physical precious metal, just like holding a bag of gold coins, a person who takes reasonable precautions will safe from having his personal coin stolen by hackers. You can save or store your coin in your personal electronic wallet either online or offline. The offline method is more hacker resistant and is recommended for everyone who owns more bitcoins but it is not without risk. Besides that you are suggested to copy your file and store as a duplicate backup every day when do bitcoin transactions.