Problem with shared xls file. Could it be blamed on rsync?

[syncro]

Hi all!

I recently had a problem with a shared excel file which was rsynced from the
file- to the backupserver. The backups of this file went wrong and I can't
figure out why. The whole rsync and dump to tapes works like charm for a few
month now.
The situation was as followed. That xls lived (and was backuped) happily for
5 days. Then the users startet to share this file among 4 or 5 people. Means
they made changes the whole day with several ppl. Everything ok on the
fileserver so far. But not on the backup as I had to discover later on. This
file was deleted (overwritten) accidently. Not a big surprise and no problem
- normaly. I do an rsync script every minute thus the backup was identicaly.
Rsync works ;) I fetched my tape backups. I have one for every day for this
server. All of them had either the overwritten (ok, backup too new) or the
version before they started to share.
Now my question. Who is the suspect? Could it be that rsync just can't
handle such files or that excel does some bullshit? I hope the later is to
blame ;)

Thanks in advance for help or hints!
Regards,

syncro
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