Anytime you move data off your server you are going to consume bandwidth. Personally, I have a backup system (using a script I got off the cpanel.net forums) that spreads the backup over 7 days, so if you have 70 accounts, the script backs up 10 accounts per day. That way the oldest backup will never be more than 7 days old. If you have any accounts that are required to be backed up daily, you can do those at the same time.
I'm only using 10% of my allocated bandwidth, so it isn't a problem to me.
I tried to use remote ftp and I see it communicates with my remote server because daily and weekly and mothly folders are made but when I look at the tar.gz in my remote folder all I see is zero bytes.
Any body knows How I can acheive remote backup?