Do I have to update my game from scratch?

Today I got cod black Ops 4 for the Xbox one s and I have to do the update there, but I'm going outside for a long time and therefore I wanted to know if it breaks off when I use the Xbox. Switch it off or switch it on the next time, at the point that ended before, thank you for your answers

No, if you switch off the console, the download of the update continues, at least for me.

But you also have to write that you have to set the console to "start up quickly"

Oh, I didn't know, because I bought my console used at the time and it was already set that way.

At least the download continues while this console is on hold. The download is only completely canceled if the console is completely disconnected from the power

No, Don 't worry. Unless you've set the Xbox to "fast boot", the update won't cancel or pause. The Xbox can't overheat as quickly either.