Accepted Solutions
If the ArcGIS Server machine is down, Portal and all applications on Portal (WAB, ExB, etc.) will continue to function, but the underlying services that the apps are consuming will not work. So in your case, your WAB/ExB apps will still open, but there will be no data inside of it (because the underlying feature services the apps are using aren't online because the ArcGIS Server is down). You'll get an error message something along the lines of "layer name failed to load."
If Portal is down, then you won't be able to access WAB/ExB at all. It depends on what exactly is down, but if your web adaptor is online but Portal is offline, then you will get an error message like this.
If Portal and web adaptor are down, then your browser just won't load anything and will eventually time out.
If both Portal and Server are down, then you'll most likely notice something wrong with Portal first because you won't be able to load the Portal site. But that doesn't mean something isn't wrong with ArcGIS Server as well.
I'm not sure what you mean by "supporting snapshots", but as far as documentation, Esri's ArcGIS Enterprise documentation might provide some insight as well as Esri's training courses might help as well.
If the ArcGIS Server machine is down, Portal and all applications on Portal (WAB, ExB, etc.) will continue to function, but the underlying services that the apps are consuming will not work. So in your case, your WAB/ExB apps will still open, but there will be no data inside of it (because the underlying feature services the apps are using aren't online because the ArcGIS Server is down). You'll get an error message something along the lines of "layer name failed to load."
If Portal is down, then you won't be able to access WAB/ExB at all. It depends on what exactly is down, but if your web adaptor is online but Portal is offline, then you will get an error message like this.
If Portal and web adaptor are down, then your browser just won't load anything and will eventually time out.
If both Portal and Server are down, then you'll most likely notice something wrong with Portal first because you won't be able to load the Portal site. But that doesn't mean something isn't wrong with ArcGIS Server as well.
I'm not sure what you mean by "supporting snapshots", but as far as documentation, Esri's ArcGIS Enterprise documentation might provide some insight as well as Esri's training courses might help as well.
