Also, in regard to your second question, all you'll need to do to update a server is:
1. Shut it off.
2. Delete the folders "config," "flan," "hats," and "mods" in the main server folder. Delete the folder "libraries" in the "jar" folder.
3. Reupload the folders you just deleted, but use the folders from the new server files.
4. Turn on the server.
If all went well, your server should be updated to 1.0.13c! (or whatever version you're updating it to)