We have a client who has been very happy with Appian on the Cloud for a good length of time, but is now questioning whether all the data being generated by our app and the app itself shouldn't be hosted on their own servers. I know it's not typical to start Cloud and then later go self-managed, but that's what the powers that be are seriously considering. We have recommended against, but they have what they consider to be compelling arguments to pursue hosting the app themselves.
About the only guide we have to go on is the guide for going from On-Prem to Cloud (in reverse?), but I wonder if anyone else has ever had to perform this operation and can steer us clear of some of the pitfalls they discovered during Migration. What we've been asked to deliver is a guide on how to Migrate the Cloud hosted app to their own server, along with everything we'll need to have in place before we begin.
This, thankfully, is just in research phase, but research on this exact procedure lacking, so any comments would be appreciated. If anyone has documentation of a VERY strong case for not doing this and sticking with Appian Cloud, that could also be beneficial.
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AFAIK, any migration between two environments works very similar. In case they worry about the data, why not make the cloud a private one and connect a separate database system? For the exact details, I suggest to get support from Appian.