sftp backup not working ?

Hello,
i am rather new on Cyberpanel - I have a problem ; not sure why and if it is a bug but here it is:

I want to create BACKUP and INCREMENTIAL BACKUP (both)
I have another VPS with RSYNC etc working.

when i enter the VPS credentials on “add new destination” for INCREMENTIAL BACKUP, it works perfectly.

but when i enter the EXACT SAME credentials on “add new destination” for BACKUP, they are NOT working…

do i miss something ?