Using chroot to run partimage to backup hdinstalled knoppix?

[metavoid]

I could use some hint on how to backup my knoppix partition without
booting on a cd.

I have my system on /hda1/ and I was wondering how I could be allowed
to umount it without having to boot on cdrom. I want to run partimage on it and it insists that it should not be mounted.

So how difficult is that?

Thx

[metavoid]

well, it seems like the chroot command is not as powerfull as I
expected.
Even its easy to setup a chrrot inv with
the needed commands, its still not possible to umount the 'system' partition to
run partimage on it.

I guess its possible to boot into an image installed on another partition using a floppy
but thats not easier than using a cdrom.

So my questions is:

Is it possible to umount the system partition without booting
on other media (floppy, cdrom) ?

Like having a boot image on another partition and boot into that?

Thank you