Can one do incremental backups from a server with Filezilla (how?)

"I dont think you can do it with filezilla.

You could look at rsync if you just want to copy over the files that are new/changed.
It is on all the linux distros, and I think there is also a couple windows ports.

If you are using windows, I am not sure if the rsync client can run in server mode to receive the files. If you are using linux, then you are all set."