$ xfconf-query -c xfce4-desktop -p /backdrop -lv
/backdrop/screen0/monitor0/image-path                   '/home/###/picture.jpg'
/backdrop/screen0/monitor0/image-show                   true
/backdrop/screen0/monitor0/image-style                  0
/backdrop/screen0/monitor0/last-image                   /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/last-single-image            /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/workspace0/color-style       0
/backdrop/screen0/monitor0/workspace0/image-style       5
/backdrop/screen0/monitor0/workspace0/last-image        /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/workspace1/color-style       0
/backdrop/screen0/monitor0/workspace1/image-style       5
/backdrop/screen0/monitor0/workspace1/last-image        /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/workspace2/color-style       0
/backdrop/screen0/monitor0/workspace2/image-style       5
/backdrop/screen0/monitor0/workspace2/last-image        /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/workspace3/color-style       0
/backdrop/screen0/monitor0/workspace3/image-style       5
/backdrop/screen0/monitor0/workspace3/last-image        /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/workspace4/color-style       0
/backdrop/screen0/monitor0/workspace4/image-style       5
/backdrop/screen0/monitor0/workspace4/last-image        /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor0/workspace5/color-style       0
/backdrop/screen0/monitor0/workspace5/image-style       5
/backdrop/screen0/monitor0/workspace5/last-image        /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor1/image-path                   /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitor1/image-show                   true
/backdrop/screen0/monitor1/image-style                  5
/backdrop/screen0/monitorLVDS-1/workspace0/color2       <<UNSUPPORTED>>
/backdrop/screen0/monitorLVDS-1/workspace0/color-style  2
/backdrop/screen0/monitorLVDS-1/workspace0/image-style  5
/backdrop/screen0/monitorLVDS-1/workspace0/last-image   /home/###/picture.jpg
/backdrop/screen0/monitorLVDS-1/workspace1/color-style  0
/backdrop/screen0/monitorLVDS-1/workspace1/image-style  5
/backdrop/screen0/monitorLVDS-1/workspace1/last-image   /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitorLVDS-1/workspace2/color-style  0
/backdrop/screen0/monitorLVDS-1/workspace2/image-style  5
/backdrop/screen0/monitorLVDS-1/workspace2/last-image   '/home/###/picture.jpg'
/backdrop/screen0/monitorLVDS-1/workspace3/color-style  0
/backdrop/screen0/monitorLVDS-1/workspace3/image-style  1
/backdrop/screen0/monitorLVDS-1/workspace3/last-image   '/home/###/picture.jpg'
/backdrop/screen0/monitorLVDS-1/workspace4/color-style  0
/backdrop/screen0/monitorLVDS-1/workspace4/image-style  5
/backdrop/screen0/monitorLVDS-1/workspace4/last-image   /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/screen0/monitorLVDS-1/workspace5/color-style  0
/backdrop/screen0/monitorLVDS-1/workspace5/image-style  3
/backdrop/screen0/monitorLVDS-1/workspace5/last-image   /home/###/picture.jpg
/backdrop/screen0/monitorLVDS-1/workspace6/color-style  0
/backdrop/screen0/monitorLVDS-1/workspace6/image-style  5
/backdrop/screen0/monitorLVDS-1/workspace6/last-image   /usr/share/xfce4/backdrops/xubuntu-wallpaper.png
/backdrop/single-workspace-mode                         true
/backdrop/single-workspace-number                       2