Who to call for support varies by customer and the services offered by their Partner.  (We don't support IT infrastructure and only advise what platforms are on the SPM for Sage 100, leaving IT services in the hands of whoever our customers choose to manage their IT).

FYI, Sage Partner Cloud is a new Azure based offering which Sage has recently released (as an alternative to in-house servers or a hosting service).  Currently it is for Standard only (not Advanced / Premium).

Comparing different strategies, it is necessary to consider TCO. 

Ex.  Buying an in house server may seem the most cost effective in the long term but when you consider the cost of support and admin for that solution, plus extras like backup and recovery, offsite redundancy, connect from anywhere (firewall configuration)... the costs for an in-house solution keep adding up.

DIY on Amazon / Azure, and you again have the same types of considerations, except hardware purchase / maintenance is out of the picture.  An all-in-one service provider may look more costly on the surface, but you don't have as many additional costs for other critical considerations.  (I.e. ignore serious backup and recovery discussions to your own peril).

We know of a company who, due to their choice of IT provider (with in-house hardware) and poor backup strategy, is now suffering after a crypto attack where the backups were lost too.  If they had chosen a fully managed environment with specialists taking care of their data / systems, they'd have probably been back up and running in less than a day.  As is, they are looking at a permanent loss of years worth of irreplaceable data.  Hardware / hosting / licensing costs are not the only variables.

We had a customer who had a building fire years ago where the server room was a total write-off, but the general manager was / is excellent when it comes to managing their IT considerations, and they had zero loss of data.

Good IT strategy is critical, especially in today's age of ransomware.  Specialists who know Sage 100 can also save end users a lot of time by understanding the unique nuances of running Sage 100 servers.

I have used AWS EC2 since it was first offered to host the BASIC forums I facilitate. I use S3 for daily backup and Route53 for DNS. When the city I live in offered a fiber connection (1 GB UP/DN) I switched to hosting the forums local and have a sleeping EC2 mirror for disaster recovery if my server fails. I still use S3 for backups and Route53 for DNS.

You're skilled technically and can handle your IT heavy lifting yourself. 

My comments were aimed more at the user community who might be reading this thread.

If remote access is the only reason you're looking at the cloud, a better and more cost effective solution is equip your local MS Server with a RDS license and have uses connect to your local server. 

Quick fixes can add costs in other ways.  Exposing RDS to the internet opens up a network to direct attacks (like PrinterNightmare), and requires a skilled IT person to configure the firewall properly to keep things secure.

The most common reason we get asked about cloud is that customers don't want to have to manage their own hardware (with all the costs / risks associated with doing that internally).

Cheap high speed fiber has changed the cloud to be more of a resource than a destination.

Cloud computing is just someone else's server.  Quality of service depends on who that "someone else" is...

We have customers in remote locations where their internet goes down often, so cloud is not really an option for them.

Service is the key to making any configuration work. My point is paying outrageous hosting fees isn't your only option. Most of these services load up a server with as many clients they can to make a profit.

My point is that those higher hosting fees can include services above and beyond just hosting.  Not all hosting providers are the same.  Profit is not an evil concept and can be earned / worth every penny.

Edit: there are bad actors in every part of life.  Buyer beware, but hosting providers have a tough job (especially in the age of the crypto-virus) and the good ones don't deserve their whole industry to be thrown under a bus.