I had updated to Win10 using Windows Insider long time ago, Lumia 640.
Last night I decided to hard-reset to see if it would make the phone smoother.
Before doing that I backed up.
I thought I would install 'contacts+message backup' so I could back up SMS messages. Installation went smoothly, but when I tried to backup contacts and messages, it would quit after a few seconds.
I did a hard reset anyway.
Now, all my SMS messages are gone. Some of them I had saved on OneNote, but all the others were gone !
I had done hard-reset many times before, but this is the first time something went missing.
So, backup, backup and check backups before resetting,
Regards