Next time your co-worker asks:
"What's the best way to back up my Eclipse workspace on Windows?"
you can tell them "Just right-click on it and select 'Send to Compressed (zipped) folder' and save the zip file". Unbeknownst to them, you just pulled the ultimate prank by telling them to make a corrupted backup!
What your friend probably doesn't realize is that the Windows 'Send to Compressed (zipped) folder' utility has a mandatory optional feature to automatically not include certain folders in the archive without telling you [robertelder.org]. This is a great feature because it demonstrates the excellent sense of humour that the authors of Microsoft Windows have. This feature was no doubt included to allow you to play a variety of hilarious pranks on others by causing them lose data, only to find out about it years later when they want to open the archive and recover it.
Reasons you haven't switched to Linux (cont.):