Firstly it is backup and not bake up.

And why do you need to make the backup as a flashable zip. You're making things more complicated.

Just backup through CWM by going to backup and restore>backup to storage/sdcard1 or 0.

You can simply restore it by going to backup and restore>restore and select your restoration file.

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And on rr 5.0.3 using evolution kernel 1.5
Kernels are my speciality....

My Works:
Galaxy Grand Duos:
*DedS 4.4 Kernel

Galaxy Grand 2:
*DedS v2 4.4 KK Kernel

Motorola Moto X:
*Drool 4.4 KK Kernel

Xiaomi Mi 3:
VanirAOSP 4.4.4