[horde] Horder User Preferences are deleted

[Luis Felipe Marzagao]

Thierry Lavallée escreveu:
> Hi,
> Server maintenance often RESET all horde user preferences to default
> (their signature and other account display preferences).
>
> We are wondering where those are stored, why they are deleted and how
> should we manage to keep them safe.
>   
It depends on how your "Preference System" is configured under 
Administration > Horde.
> thanks!
>