[CentOS] yum update in background

> greetings,
>
> is it a proper way and/or good idea to perform a yum update in the
> background like this?
>
> yum -y update &
>
> at this moment, i do not have as reliable of an "wireless access
> connection"
> to the remote server machine at the data center as i would like and i want
> to take this one box from 4.1 to latest 4.2

use screen or nohup?

-Mike