Here is an example on how to solve issues we got writing to SD card. But please beware :
This will apply to any Koombook on field (we could for example enable this on a project basis).
If applied as is, old logs will be "lost", as in inaccessible (changes applied after next reboot).
We may have a broader look at which folder may be missing (modoboa?). Most apps aren't recreating their log folders in /var/log if it is missing.
As it is, it's roughly tested. The idea is to give a simple base to talk about. My first opinion after writing this is : it should be included in Koombook system image, not run by ansible (see third point).
Here is an example on how to solve issues we got writing to SD card. But please beware :