FWIW, I keep a working logbook for daily use at the training organisation, I copy up each day into a "fair log" which is one of the Aviation Theory Centre logbooks (and stays at home), and I also keep an electronic logbook using the spreadsheet module of MS Works v7. When the computer is backed up, so is the electronic log.
The log is also duplicated on my notebook 'puter. Electronic logging via a spreadsheet allows accurate tallying of hours for various duties etc but I still like the handwritten logbook(s) as a permanent record.
Fortunately I am not in the heavy commercial end of aviation, so this arrangement works well for me. Whether this satisfies CASA is not relevant as I don't operate under their immediate aegis.