basic rsync questions

[unixjingleman]

Hi there
I want to rsync my FreeBSDs to an external usb drive that is attached to a Linux box. If i create a single, non-bootable root partition on this external drive, create an ext3 file system on this partition and do the necessary ssh public key set up would these commands back up the entire FreeBSDs, so that the entire system could be completely recovered in the event of an emergency?:

#rsync --progress -avhe ssh --delete --exclude /dev / user@Linuxbox:/usb/drive/path/dirBSD_x

Or should this be done differently from a FreeBSD system? Would just specifying / only back up the partition that / lived on? Or would it back up the whole system into /usb/drive/path/dirBSD_x ?
I'm not joking i really am a complete n00b with BSD. Any answers would be great. Thank you
regards unixjingleman