I regulary backup my computer to my BananaPi with a Hard Disk connected. The Problem is, that the transfer speed over ssh is pretty low because the Pi can't handle AES 256 encryption quick enough. Since this is a save LAN, I'd like to lower the encryption strength to get higher datarates. Preferably only sometimes, because when I administrate things, I would feel better with a higher encryption.
You might have some luck trying different values of the
Ciphers option in your ssh_config. Additionally try reducing or disabling compression if your network connection is fast enough to cope to take some extra load off the CPU.