Some more Rsync questions

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http://www.linuxquestions.org – ok so i am a total noob at linux i managed to copy a file using rsync from one of my linux boxes to another one over the internet...i just have a few more questions and would appreciate it if you could just give me a push in the right direction... this was a simple command from my terminal...but i realise if i want to backup a server with many directories i will need to create a bash script right? i need the rsync script to run at a certain time, i will use cron to do this...this i understand. what i dont understand is this... how can i get the script to login with the remote linux box autom (HowTos)