I have recently got an app that permits me to view the contents of my phone memory on my rooted Samsung Galaxy Y mobile phone.
In /system/app folder, I see all the system apps that came pre-installed with the phone, and also I see a .odex corresponding to every .apk file.
What exactly are these files?
I wanted to keep a backup of all these .apk files in my laptop, just in case.
Should I backup the .odex files too? Why or Why not?