by mad_ady » Mon Jul 31, 2017 10:36 pm
SFTP is included as part of dropbear - the SSH server. Simply set a root password and you should be able to use any SFTP/SCP client (like Filezilla/WinSCP).
Regarding LUKS volume support - I don't remember. I don't think it's included by default. If it needs a kernel module to work, then it might be difficult to do. If it needs only userspace tools, then you might need to compile them for the mips architecture.