Restore for manufacturer repair

good day together

I have a small question

I have a nokia c03-01.
I made a backup of my apps and data before that I have been in the repair (operating system updates, I could not install).
now I got it back, now I want to know if I my backup of my apps and data back again to load, or is everything just always reloaded (including operating system)?

if so how do I have to make the ONLY apps and data back to load and not the system
I feel especially for whatsapp.
to my messages (sms) I ship by whatsapp, so it would be great if I could load onto the back nokia.
or there is a possible esen speed of backup from these to load in a program to the news of whatsapp can.
the contacts, calendar I sync via push mail.

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