The latter of course requires you to have local login rights to the remote machine. That can be achieved by using a rsync daemon on the fileserver (remember to open its rsyncd port in the firewall), or by using ssh as a transport medium between the two machines. However, if you use two different rsyncs on both the source and the target machine, you will in fact get a huge speed up! Both separated rsyncs build their checksums of the file in question locally (without transferring any bit of it!), compare these checksums over the network and then decide which (changed) parts of the huge file to transfer. Here, that one-and-only rsync of course needs to "fetch" the whole file from the share to the client to do its comparing/copying. copying between a share and a local disk. In virtualized environments leveraging VMware ESXi and vCenter. I think that affects only transfers where just one single rsync works, eg. Dell EMC Select Datadobi Dobiminer EMCopy. No algorithm can speedup the process, because rsync (for example) have to read the entire file on client and on server to find duplicate contents.
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