Campbell Scientific PC400 Datalogger Support Software - Manual (Page 24)

Section 3. Installation, Operation and Backup Procedures
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While loss of power won’t always cause a file problem, having files backed up
as described above will allow you to recover if a problem occurs. If a file does
get corrupted, all of the server’s working files need to be restored from backup
to maintain the synchronization in the server state.
3.2.4 Program Crashes
If the communication server crashes, there is a possibility that files can be
corrupted (note, however, that corruption is much less likely with a program
crash than during a power loss, since the computer operating system remains in
control and can close the files left open by the failed program). If, after a
program crash, the server does not run properly, you may need to restore the
data from backup.
If you have problems restarting the PC400 server after a program crash or it
crashes as soon as it starts, make sure that the PC400 server has not left a
process running. You can check this by going to the Windows Task Manager
and selecting the Process tab. In the list of processes, look for the Toolbar or
one of the client applications. If one of these processes exists but the Toolbar
is not running, select this process and click “End Process”; you will be asked to
confirm the end process.