I use WebPro to do updates and then PCPro for doing backups and restores. The update is a simple process as Vlad93 describes above, but totally agree with doing them while onsite. Would hate for something to go sideways and not be onsite for it. WebPro upgrade, depending on which version you're installing, takes 4-5 minutes to upload and then another 4-5 minutes to reboot.

SV8100/9100 has to be one of the easiest platforms to install updates on.