You can use the Datastore Browser to copy virtual machine disk files between hosts. Disk files are copied as-is, without any format conversion. Disks copied from one type of host to a different type of host might require conversion before they can be used on the new host.

You can download virtual disks from a datastore to local storage, but you cannot upload virtual disks from local storage to a datastore, because the disk format cannot be verified during the upload.