I've done some looking into into it and I think that I understand it enough to be able to edit it to my needs.
I think that filetool.sh is the script that performs the backup and this line:
sudo tar -C / -T /opt/.filetool.lst -X /opt/.xfiletool.lst -czf "$MOUNTPOINT/"$FULLPATH"/${MYDATA}.tgz"
is the one that does it (in my case).
So after my research I've come to the conclusion that /opt/.filetool.lst contains a list ov files and directories relative to / (thus no / is needed at the beginning ov each line)
/opt/.xfiletool.lst contains a list ov
patterns separated by newlines. These patterns are used to determine what files are excluded. (If you know about globbing, which I don't, you can use it in this pattern.)
Anyway, there is a wiki article/page/whatever you call them, that talks about this it is here:
http://wiki.tinycorelinux.net/wiki:backupIn the second section it says
To edit /opt/.filetool.lst or /opt/.xfiletool.lst use a Root Text Editor. Open the terminal and type
sudo editor
Include the directories relative to the root directory, and leave out the leading /.
It seems to say that both files list files in the same way, which isn't true.
If I'm correct in the conclusion that I've come to then I think that someone (me?) should update the wiki.