In the same page that was mentioned earlier http://techbase.kde.org/Projects/PIM/Akonadi#Akonadi_TODO , there is an item "Scheduled for KDE 4.3 / Akonadi 1.2" that is titled "Filesystem backend" and is described as "Store content data in files instead of the database, transfer filehandles instead of data to the client".
This item is noted as "DONE". I suppose that now that akonadi is at v1.2 in sid, it is possible to use this? 'and even have it used by default?) Of course, it's possible I misunderstood that.
