I was copying the first two pages of a .rtf document that ended with an email addy.  I copied from one .rtf document and pasted over something simalar in the 2nd .rtf document.  Everything looked great and I closed out both documents.  On opening the pasted to document all but the first line was gone.  (I had done this to 4 documents before I tried to read one of them.  Can you see the PANIC in my face?  80+ hours and a whole lot of creativity down the tubes!)  (I was able to retrieve old deleted files and recover most of my work.)  Note: Backup should be turned ON and only optionally turned OFF by the user.

example:
- - - - - - - -
Line 1
line 2
line 3
someone@youknowwho.com

followed by 40 pages of text.
- - - - - - - -

Copy Line 1 thru the blank line after the email address and then paste over a very simalar document from Line 1 to the end of the blank line after the email address.

Both docs look OK.  Save and close both.  Open the doc you copied to.  Only Line 1 remains ... sort of, all of its formatting is gone.