Bscp – Secure and efficient copying of block devices
Bscp copies a single file or block device over an SSH connection, transferring only the parts that have changed. In other words, it handles the edge case where RSync fails.
bscp SRC HOST:DEST [BLOCKSIZE] [HASH]
The default BLOCKSIZE is 65536 (64 KiB). The default HASH algorithm is sha1 (SHA-1).