As you are a Premium Subscriber, set up your MyRR page with the counties and trunked systems of interest to you. When one of those are updated, you'll see the color highlight of green, for updates within the past 24 hours, or yellow, if an update was made in the last 7 days. That way, when you access RadioReference, you'll see right away if anything has changed.
Quite often, the change is minor, adding or editing a text on the page. In those cases, there is no need to immediately update the system in Sentinel nor on the scanner. If it's only a minor change, adding a talkgroup or two on a trunked system, or a change in the conventional channels for a given county, then I generally just make the change in my Favorites lists. That's quicker and easier than appending a system from the database (after the database gets the weekly update), especially when it's a large regional or statewide system, where appending the changed talkgroups may cause all the sites to be appended as well. Then you'd need to edit out (delete) the sites that are not applicable to your area.