Samsung: Backing up messages fails I am trying to back up a Samsung S5 mini (SM-G800F, running Android 5.1.1) using either Samsung Kies or SmartSwitch.  With either program, the backup stalls for a very long time when it gets to backing up messages.  When it finally recovers, it announces that backing up messages has failed (the rest of the items are fine).


  The following categories have failed to back up due to an error.
  
  Messages — Device not responding.


Has anyone else encountered this problem?  What could be the root cause?  Is there anything I can do on the phone itself to correct this, and allow messages to get backed up as well?

In the past backup has worked correctly with the same phone.
I had the same problem for month, I updated to the last version of smart switch today and have reboot my s8 yesterday (I have almost 25% of free space on the phone)
I gave a new chance to the backup with smart switch today and, after being stucked for almost 2 hours on "backing up message" at 18%, it finally went to the next step of the backup!
So my advice is : patience (and use an usb 3 port!)