Q: my back up keeps giving me a message that "time machine could not complete the backup folder.  It just keeps popping up and I have to cancel it to continue using my computer.  Any thoughts on my problem would be appreciated.

My computer keeps getting a message that "Time Machine could not complete the backup.  It continues, "Unable to complete backup.  An error occurred creating the backup folder.  I have to clear the pop up from my screen to continue using the computer.  It is getting very tiresome.  Any thoughts?