Thread: Zipping and unzipping files again and once more corrupts files?

I am having the desktop computer system which has the Windows 7 ultimate operating system. I have kept some backup files in archive file so that all i have to do is extract the data from a only one folder and everything is sorted in case of a HDD damaged. I want know my zipping and unzipping files corrupt data? I just add new files to the existing archive and don't make the archive done again. .Please helps me to get rid of this problem. Thanks in Advance.

These settings are regarding compression, changing the setting to "best" will not protect file integrity, just potentially decrease the size of the archive and raise the length of time to make it. If you put it to "Fastest" the archive will be produced faster but the compression will be reduced.