Lesson learned

I've been tasked to do some major modifications in a design document.  Since it's company policy not to copy any sensitive document to our local drive, I just made another copy on the same server to do my changes.  Yesterday morning I opened the document as usual and started doing my changes.  I clicked on  the save icon every once in a while to make sure my changes are saved.  At past 7pm as I was about to leave and almost gave myself a pat on the back for finishing the changes, something bizarre happened.  When I tried closing the document I got a message prompt to save my changes which is weird since I've been clicking the save button ever since. Whenever I try to save, the same prompt appears.  So I just cancelled and clicked on the save icon again, saved as usual (I thought) and no message prompt whatsoever.  But when I closed it again the message prompt was displayed again.  Since I was annoyed by the message and I'm eager to go home I just proceeded to close the document without saving.  In my mind I thought if there are changes I haven't saved since my last save, it would be minimal.  But I was wrong, I felt like crying when I opened the document again and found out all my changes for the day were gone.  I looked at the last modified date and it's still dated last Friday.   After a while I figured out what happened.  The #%^@#!*%^# server has no more space!  All along my changes were only saved in the memory, stupid MS Word, it should at least prompted some error when I click on the save icon. Another weird thing is I only attempted to close the file as I finished it, it's quite normal right?  or is it just me?