Backup os with mbr or not

I wanna make a backup today but i got a newest paragon hd manager and when i wanna go a safe route with wizard there is a option i dont know..
I remember that i was talking on a cdr forum before and i was told something about mbr-master boot record_but cant remember.
Anyway i wanna backyp my c drive(partion)which got my windows and all proggys installed.
As you can see i got an option to check on mbr??I can just click on c but can add an mbr too..but should i do that??
Its not written in help file and i dont feel like waiting for their support??
 

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