rsync problem

[GioMBG]

Hi All,
I'm a newbie of rsync and today I make a test to understand that this cmd is potentionally VERY DANGEROUS (to nwebie like me)...
explaning:
Basically I need to backup all vhosts dir from server 1 to server 2 running rsync on server 2:
THIS WAS WRONG:

rsync -avrz /var/www/vhosts -e ssh root@server2:/var/www/

with this I think I downgrade or I BAD sinck the server1 to the old server2 so the opposite operation that I wanna do and @ this point I'm not sure about what happened BUT:
what I have to do is run rsync on server2 to backup all the server1 on server2
THX
GioMBG