Disappearing disk space?

Hi - hope someone can help here...

I'm running SBS2003 SP2 on a 12Gb system partition with additional data
drive. Normally the system partition has about 2.5G free space. BUT...

At about 03:00 (local time) on most days (but not all!) this space suddenly
disappears, and the disk becomes full - so we have the usual mayhem which
happens when the system disk fills up - DHCP and licensing services fail,
etc etc.

Almost always, the disk space magically reappears soon afterwards (I can't
tell exactly how long, as there's no event to indicate it, but certainly by
07:00), so the server is fine by the time users need it. But today it
wasn't - the system remained at zero free space at 9am, so I deleted about
200Mb of rubbish, then rebooted. When it came back up, there was 700Mb of
space on C - not 200Mb or 2.5Gb.

Some extra info...

1: I checked the Properties of all the files and folders in C:\, and totted
up the disc space used. It's about 9.5Gb, meaning that there should be
2.5Gb free space.
2: Automatic Updates is set to Check and Notify for new updates, but not to
download them.
3: We have a scheduled backup system (Veritas Backup Exec) running at 11pm
every night, but as far as I can tell there are no processes initiated at
3am.
4: Nothing appears in the System or Application event logs to indicate what
causes the loss of space - the first indication of a problem is a system
event 2013, indicating low disk space, which happens shortly after 03:00..

So does anyone have any idea where my system disc space is disappearing to
at 3am most days, and how I can reliably get it back?

Thanks
Nik


.

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