Hi, Thanks for useful suggestions. My laptop fell  down to wooden floor, since then it displays a line of msg saying somthing is missing ( i havent remember the correct line thouogh). It also produces beeping sound like clock. I dont have sound knowledge in IT/hardwares so called a technician. He took out it, joined to his computer and daignosed as hard drive damaged and gave a quote of 300$ for replace. He said data recovery is expensive and he is not trained to that level. So I just hold on to browse alternatives before moving ahead for repair. 

Ya, I agree, backups are crucial and I was used to for it excet last several months when I could not prioritise it and this happened.

Thanks a lot, I may try some alternatives you share.