help with a very simple backup script

Hi all! could anyone help me with a very simple script? (it simply doesn't work the variables stuff) and also how can I modify this (tar) to retrive only files which I might get as new from $(find ...) set $FN = etc-$(date +%Y-%m-%d) tar -cf $FN.tar /etc/ gzip $FN.tar THANKS A LOT!!!!!