Hi Daniel,

a crash of the machine could have lead to a number of problems unrelated
to roundup, which may affect it, though.

Best would be to try a recent backup of the machine's disk with a consistent 
state. But I guess you would have done this, if you would have a usable backup.
So you are facing a harder problem. 
Best is to seek help on the user list, you could of course write a script to 
reconnect some of the data again to recover. 

I don't think this is a general roundup issue, it depends on the database backend 
used and on the type of the damage done. Roundup must make some 
assumptions about the consistency of its computing environment and cannot cope 
for general "crashes".

Best Regards,
Bernhard