your backup scheme is simple and will work fine. the system we moved to is storserver which makes a full backup of all systems once, then only backs up files that have changed since then and recreates it’s own full disaster recovery backups from the backup tapes. that way there are no long full backups again unless you tell it to. that cuts WAY down on backup time. we even backup servers across our 256k lan lines and it works fine. expensive though.
the one thing that I noticed is your windows updates. you might want to run them on tuesday since MS’s updates are on a tuesday every month. if it comes out on tuesday you will have almost a full week before your systems get patched. if the updates are critical then you will be vulnerable for 1 week. you don’t have to run them every week since patch tuesday is only monthly. BUT, it is a good idea just to CYA. As seen just recently MS does rarely put out patches off of schedule if they are critical enough.
hope this helps!