make onboot.lst like this
Xvesa.tcz
Xprogs.tcz
jwm.tcz
wbar.tcz
OSS.tcz
immediately after system boot with these configuration will employ about 20mb memory
all further extensions such as mplayer, browser etc can install as ondemand
and they will not take time during boot and not take memory until start them
and you do not have to include usr folder to backup
all current data of these extensions are written in home folder
and will be backed up during reboot and will be ready after reboot