Yes. When you copy into an existing target environment, BCV5|6 performs a compatibility check before the actual copy is done. This compatibility check ensures that the objects of the source and target have compatible attributes. For instance if you have a tablespace that is in the source located in a 4K bufferpool and in the target the tablespace is located in a 8K bufferpool it is not possible to copy the tablespace directly on VSAM level. In this case BCV5|6 switches automatically to UNLOAD/LOAD for the respective object to ensure that the object is copied anyway. This UNLOAD/LOAD process is also integrated in the BCV5|6 copy process.