We need to trasnfer a lot of data within a CIFS share and we're wondering wheter there is an alternative to the file transfer at a file system level (NTFS). Trying to transfer the data through the Windows Explorer is quite slow and make things really awkward.
Level 0 copy you can do it any time, you can put it as base level copying, when you start base level copy ndmpcopy command create a snapshot in volume and locks the data and copy it to destination over network.
Whereas you can say level 1 and level 2 are incremental copies and can be done sequentially, only data that has chnaged on source since base level copy was done is copied over to destination.
Please keep in mind you can not to level and level 2 copies multiple times where as you can do base level copy anytime you like, and it creates restore_symboltable file at destination which act as base for level 1 and level 2 copy.