Openatv 7.6 full backup question

[ciefp]

Hello, I have openatv 6.4 installed on a flash , on a multiboot openatv 7.6.
Is it possible to do a full backup on openatv 7.6?
When I go to the image backup option, I get a file of only 4mb. I see that the rootfs is missing in the file.
Does atv 7.6 have to be on the flash drive in order to do a full backup?
This was not the case on earlier versions.
Thanks

[Papi2000]

What Box?

[ciefp]

What Box?

VU+Zero 4K