In A Web App Where Is Data Stored. Retrieve the local app data store Powerapps only connects to the data source, it.
Click the file tab > info > click manage within the connections group Use the local app data store for data that it does not make sense to roam and for large data sets. “c:\users\[username]\appdata\local\packages\5319275a.whatsappdesktop_cv1g1gvanyjgm\localcache\roaming” if you can’t find the whatsapp folder, then search for it in your pc.
Open the access web app in the access client;
Like if it's a sharepoint online list, then the data is stored in office 365. Yes, it is possible to connect to an access web app. That means all of your data is stored locally. You can install everything on the web server which would mean that the data would be stored on the web server, but you can also deploy the data layer o a seperate database server, in that case the data would be installed there.