Yes, you can easily move a Case File from your iPad (maintaining the organizational structure of your documents, annotations, etc.) to a cloud storage provider, USB thumb drive, or connected USB hard drive, using the built in Files app. Any service that integrates with the Files app (e.g. Box, Citrix Files, Dropbox, Google Drive, iCloud Drive, OneDrive, etc.) can be used to store, backup, or transfer your Case Files.