Troubleshooting & messages · Moving, offloading and restoring apps
Why does Storage Studio say moving while apps are running can corrupt their data?
Short answer: An app writing to a folder during a move can lose recent changes or see its data as damaged. Quit the listed apps first, or continue only if you're sure they're idle.
If an app is writing to a folder while it's being moved, the app's latest changes might not make it into the copy, and the app may treat its data as damaged. Storage Studio lists the apps it found and recommends quitting them first.
You can continue anyway if you're sure those apps aren't writing anything important (for example, they're idle viewers). When in doubt, quit them.