how to get backup from hard disk!!

I got some problem in my new laptop and i m still newbie for laptop.
Due to some battery problem it goes to turnoff while i was working on
my Java coding, i want to back up from hard disk but, i can't. i don't know how to
recover important data from hard disk please anyone suggest me the right way.
I would like to thanks them

You have many options for backup your data:
1) Write them to CD/DVD
2) Copy them to external USB Flash disk
3) Copy them to external HDD
4) Copy them to another networked pc or disk
etc.......

Important data are these data you may lost when a problem occurs and you don't want to lose them!!

Good luck