In addition to its primary purpose of migrating data from remote sources, the same mechanism can also be used to migrate data from local filesystem to another on the appliance. This can be used to change settings that otherwise cannot be modified, such as creating a compressed version of a filesystem or changing the recordsize for a filesystem after the fact. In this model, the old share (or subdirectory within a share) is made read-only or moved aside, and a new share is created with the shadow property set using the file protocol. Clients access this new share, and data is written using the settings of the new share.