If you have synced your conboy against Ubuntu One yesterday, you might note that all notes are gone. Ubuntu One has posted note on this issue (https://wiki.ubuntu.com/UbuntuOne/Status):

2013-02-04 Some users were reporting their notes are missing. We discovered the problem which was caused by an update on the server side. We tested the fix and rolled it out. Notes should now successfully sync. If your notes do not come back, please see the following FAQ: https://one.ubuntu.com/help/faq/how-...-tomboy-notes/

But conboy can't restore notes via described procedure. I have had to install tomboy on desktop pc, sync notes there, and copy them using scp to /home/user/.conboy directory.