Image Backups started with R-J3. On an R-J2 system you can only do Controller Backups through the Controlled Start mode and Controlled Start 2 menus to Backup Controller or Restore Controller.
That's true. I ran into this the other day with an arcmate robot. The original BMON was v4.15 and didn't have the option for controller backup and by the way, the ability to check the FROM, SRAM and CMOS. I installed v4.22 BMON and it had the option for controller backup and the ability to check the memory chips.
So check your version of BMON to see if you have the correct one. There is a difference.