40G Free space, but get not enough disk space to back up iPhone.

I have a 32GB iPhone 5S and get the error that iTunes could not back up the iPhone because not enough free space is available on this computer. I have over 40GB of free space on my hard drive. Get the following error in the log:

[12140 @ Mon Nov 02 20:11:45 2015] [com.apple.console AppleMobileBackup.exe] Unable to move temporary file "C:\Users\*\AppData\Roaming\Apple Computer\MobileSync\Backup\Logs\MobileBackup-unknown-20151102-201145-Backup-Com puter.log" (2)

[12140 @ Mon Nov 02 20:11:45 2015] [com.apple.console AppleMobileBackup.exe] Unable to move temporary file "C:\Users\*\AppData\Roaming\Apple Computer\MobileSync\Backup\Logs\MobileBackup-a2bf27b2d79411f1fe6246286574bb8bdd d2d344-20151102-201145-Backup-Computer.log" (2)

[12140 @ Mon Nov 02 20:11:45 2015] [com.apple.console AppleMobileBackup.exe] WARNING: Backing up a2bf27b2d79411f1fe6246286574bb8bddd2d344

[12140 @ Mon Nov 02 20:15:30 2015] [com.apple.console AppleMobileBackup.exe] ERROR: Backup message response: 104 Multiple errors uploading files (MBErrorDomain/104)

[12140 @ Mon Nov 02 20:15:30 2015] [com.apple.console AppleMobileBackup.exe] ERROR: Backup error: -30

[9324 @ Mon Nov 02 20:15:30 2015] [com.apple.console MDCrashReportTool.exe] CFNetwork module LOADED!

[9324 @ Mon Nov 02 20:15:31 2015] [com.apple.console MDCrashReportTool.exe] App data path is: C:\Users\*\AppData\Roaming\Apple Computer