SCP/SSH to DS-9664NI and Copy Files Off

Hello, I have a DS-9664NI-I8, running firmware V4.22.005 build 191208.

RemoteBackup is a crap bit of software, so I was hoping I could script my own backup and use SCP/SSH to copy files to a remote location.

I have managed to SSH connect in, but I am presented with a BusyBox piece of crap.

I just want to copy files off the device. Is this possible without custom firmware?