I wouldn't really recommend NFS unless you need to remote mount as a "true filesystem" with full support for things like sockets, locking and other UNIX filesystem features or you need top performance. It is so difficult to do authentication and UID mapping that it typically isn't worth it for simpler use cases like "add, remove or download files".
scp
can be slow with large numbers of small files. rsync
is much better at that and can do differential transfers if you need that. Since rsync
can also run over SSH it can be very easy to just use it as a default.
I don't know if the
s
is actually "SSL" or "secure" but the point is that the are the same protocol, running over an encryption layer. So adding ans
suffix is running the same protocol over some encrypted transport. You see thiss
suffix for lots of things likeirc
/ircs
anddav
/davs
.This is different to
sftp
which isn't related toftp
at all other than they are both protocols that transfer files.