Uninstalling apps?
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If I uninstall an app, does it remove all traces of that app from the disk and databases? Does it leave any residual files or data lying around?
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I believe uninstalling an app removes everything, including the database and volumes (where your /app/data is stored in each app), etc. However it does not remove backups of that app, so backups are still accessible should you ever need to restore the app if you accidentally uninstalled it or changed your mind, for example.
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And you can follow this doc to restore an uninstalled app from the backup - https://cloudron.io/documentation/backups/#import-app-backup . You have to make sure the app backup is still around though since it will get cleaned up by the backup retention policy.