How to protect your valuable data, you will know after you read below:
Set up your computer in a safe environment. Your computer should be in a dry, cool, controlled environment that is clean and dust-free. Placing your computer in a low-traffic area will protect your system and storage media from harmful jarring or bumping.
Backup your data regularly. Creating regular backups is one of the most effective ways to protect yourself from losing data. Back up data at least once a week with reliable tapes or other storage devices, always verifying that the correct data is backed up.
Use an uninterruptible power supply (UPS). In the event of a surge of electricity or lightning strike, an uninterruptible power supply protects your computer from being fried. In addition, a UPS has a battery backup that keeps your computer running for a short time in the event of a power outage, giving you time to save your work and avoid potential data loss. If UPS is not an available or economical solution, a surge protector is also a good investment.
Run a virus scan regularly and update it four times a year. Computer viruses are one of the worst enemies to your computer. Good anti-virus software tests your system for sequences of code unique to each known computer virus and eliminates the infecting invader.
Be aware of strange noises. If you hear a strange noise or grinding sound, turn off your computer immediately and call an expert. Further operation may damage your hard drive beyond repair.