restoring my external hard drive data to internal HDD

Above is my OS configuration..

** I have "backed up" my "macbook pro's data" using Time machine Utility.

**Process went well.. From next moment was able to access my backed up data by right clicking it and selecting the option "Show package Contents".

**Later I have formatted and installed new OS in MAC, my time machine utility tried to backup the data automatically when I connect above External drive(existing backed up data was there on it).

**As I have formatted my PC, folder structure was different compared to what was on External HDD. It started backing up the data which is available on PC.

**Now I am not able to see the data which I backed up at first. I don't know whether it is mounted in any of the folders or it got removed. I am just seeing the newer data.

I am worried as mine and my brother's valuable stuff was available in that backed up package. I am not seeing that package file at all.

Plz plz plz plz help...

I don't know what need to be done.

Thanks in Advance..

Note: If you guys want I'll share my desktop also with you for troubleshooting.