Well I wanna tell you that you can't save the output in demo version. You haven't read the T & Cs over there?

Oh, then I have to buy the software to save my repaired output

Well yes, you must buy the software to save those repaired output.
Buy it if you think it is worthy.

Yes it is as it repaired my files. I'll definitely buy it. And thanks for suggesting me.

Your welcome...........
Thank you.
Bye

Backup files are generally created with ntbackup.exe utility in Windows. They help you to restore data after upgrading or clean install and most importantly during data loss. However, BKF files can itself get corrupted due to interruption during backup, CRC (Cyclic Redundancy Check) errors, virus attacks, sudden system shutdown, and other reasons. Use Kernel for BKF repair software to restore all data and get rid of permanent data loss fears.