This is a huge problem as I share files with my Computer Science students via ftp. Also, I store all my Smart Recordings of my Calculus classes on the ftp server too.
centauri, ftp server, off-line
colossus, sftp server, on-line
guardian, apache server, on-vacation
BTW, we haven't done anything with apache since guardian went down. So, if and when guardian returns, I think the third service will be SAGE instead.