I am running a few websites now with ISPconfig, and I have been having trouble with hosting, I find myself bouncing from host to host looking for a stable server. at the moment I am on linode.com, I run a newsaper called http://yadisrael.org and stability is key. In order for me to make to change of hosting easy I installed dropbox, and mounted the dropbox folder to /var/www/clients, before there were any clients installed on the server via ispconfig, after mounting it I went to ispconfig created the clients and then 1: copied on my local machine the files I need to my local machine 2: set up the database. now I have a dropbox with all my data and it takes 2 hours to recover as apposed to 10
These tutorials might be of interest to you: http://www.howtoforge.com/back_up_mysql_dbs_without_interruptions http://www.howtoforge.com/linux_lvm_snapshots