usefulsolutions

I was facing exactly the same issue. Time Machine creates the initial backup with no problems. If you start a new backup run, it fails with a umount problem at a certain point. The solution for me was to adjust the SMB settings (I added the "Global" section): #unassigned_devices_start #Unassigned devices share includes include = /tmp/unassigned.devices/smb-settings.conf #unassigned_devices_end #macOS config start [Global] vfs objects = catia fruit streams_xattr fruit:nfs_aces = no fruit:zero_file_id = yes fruit:metadata = stream fruit:encoding = native spotlight backend = tracker #macOS config end This post helped me to solve the problem: