Calendar Data Gone

[Alexander Schröter]

Hi I use my Kolab Server with Kontact (Kmail) and Thunderbird (Lighning 
Extension with SyncKolab Plugin)

I just realised today that most ... not all of my Calendar Data is gone. 
And I have no clue why. This brings me to my two questions.

#1. Is there a chance to find retrieve this "lost" data?
#2. How can I prevent this from happening again. To explain the only 
thing running on this machine is Kolab for me and some friends. I 
thought about a simple script that backs up the imap directories to my 
fileserver. This should be enough to bring back the data right?

Thanks for the help.