I believe the issue with Quantum3113 is when their internet goes down, they can’t fire up D2:R to pass the downtime because of the 30 day DRM grace period.
That being said, Quantum3113 could be proactive and avoid the issue by spending a minute or two simply signing in the game once every couple of weeks to reset the 30 day timer when their internet is working, that way when the internet goes down, they’ll be covered for two weeks to a month.
I have a friend that lives out in the sticks, and yes, he’s had internet outages that have lasted a couple of weeks. So yes, I understand the headaches that come from it.
I’ve read that one can also change the date/time on the system back to ~1 year ago and get it working offline, but I’m not 100% positive on this.