How to backup Full Stock ROM on GM6 (General Mobile 6) Android One?

Hi,
This is my first post on this forum!
I have a General Mobile 6 (GM6) Android One smartphone with these specs:

Quote:

Single SIM, 3 RAM / 32 ROM
Processor Model: MTK MT6737T (64 BIT)
GPU: Mali 720
Cores: 4 @ 1500Mhz, Architecture: ARMv8-A
Model: GM6
Android Version: 8.0.0
Android security patch level: January 5, 2018
Baseband version: MOLY.R9.W1444.MD.LWTG.MP.V174.2.P1, 2018/01/03 13:56
Kernel version: 3.18.60 #1 Thu Jan 25 16:14:43 CST 2018
Build Number: O7323A

It's fully working on stock rom / un-rooted not touched anything!
How can i make a full stock rom backup without rooting my phone, (to restore or flash again with SP-FLASH Tool / Unbrick the phone if i mess up anything) ?
I have seen some methods on youtube for 32 bit processors architecture with MTK Droid tool and Sp-Flash tool but no for this type of MTK phone.
How can i backup NVRAM, Recovery, System ect... can anyone write a full working tutorial about this?!
PS: I'm not an expert at phones, consider me as a newbie
Thanks!

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