Open up your mouth baby bird! Here comes the vomit! :P

Don't C&P and run this then without making sure it does exactly what you want (I hold no responsibility ;)).
[code]#!/bin/sh

# Mount the Samba share first
# mount -t cifs //<windows_server>/<path> /mnt/<mnt_dir> -o user=<windows user>,password=<pass>

$FILE = "backup_${RANDOM}.tar.gz"
tar zcf /home/script/$FILE /home/files # or /home/files/* if you don't want to keep the parent dir
cp /home/script/$FILE /mnt/windows_mount
find . -name 'backup_*' -mtime +3 -exec rm {} \;

# umount /mnt/mnt_dir
[/code]
This might be horribly broken, but it should get you going in the right direction. This might also help out.
[code]man find
man stat
man mount.cifs[/code]