Urbackup_mount_helper test Backupfolder not set

Hello,

I would like to add the mount image button.

My server is a redhat8
I have install libguestfs-tools
But when i check with the command “urbackup_mount_helper test”, i have the response “Backupfolder not set”

How configure my urbackup server for explore my windows client image?

Thanks for your help

Erick