Controls the local files migration to the cloud.
Applies only for SkyVault users, i.e. when LocalUserFilesAllowed is false and is ignored otherwise.
If set to "google_drive", local files are moved to Google Drive and local folders are hidden.
If set to "microsoft_onedrive", local files are moved to OneDrive and local folders are hidden.
If set to "read-only" or left unset: local files remain in read-only mode.