Yes? The question is a bit confusing. jcp copies from 

host1 filesystem -> over the network -> (jsrv running on) host2 filesystem,

and while (for testing mostly) you can leave off the host: prefix on 
both giver and taker, to copy things from local disk
over the TCP/UDP network stack, and back to the same host's local storage 
-- 
this is going to be wildly less efficient than using tar or cp to do local 
disk copies.

On Friday, March 28, 2025 at 6:24:30 PM UTC G wrote:

is it able to use a local storage as backup?
Thanks

On Thursday, March 20, 2025 at 10:04:45 PM UTC-7 Jason E. Aten wrote:

I've open sourced jcp, my rsync-like file transfer library and CLI.

By using Go's fabulous multicore support, jcp can do diff-only filesystem 
syncs
up to 3x faster than rsync (which is a single threaded C program).
It uses a parallelized version of the FastCDC algorithm with a 
Gear table to ship only the changes, even in binaries.

https://github.com/glycerine/jcp

>From the README:

This project (jcp) was written to harden and polish my RPC system, 
https://github.com/glycerine/rpc25519 , whose high-performance and novel 
Peer/Circuit/Fragment paradigm is featured here. In this evolution of RPC, 
peers communicate fragments of infinite data streams over any number of 
persistent circuits. Since the roles are peer-to-peer rather than 
client-server, any peer can run the code for any service (as here, in the 
jcp case, either end can give or take a stream of filesystem updates).

Enjoy.
- Jason

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