SSD Disk lists only one partition (instead of 5)

I have A new desktop computer with A SSD disk with 5 partitions. Windows 10 is showing me this. I want to image the partitions with Acronis 2017, which I start from a bootable USB-stick.
There I only see one Partition in the backup list.
What can I do to make the other partitions visible?
Suggestions are very welcome.
Could it be A GFT record, which is unreadable for Acronis v2017?
Kind regards,
Kris van der Meij
The Netherlands

This is part of the solution. After creating bootable media with WindowsPE, i now see The correct contents of the SSD drive.
When I try to connect to the NAS as administrator, this seems to work at first. But networktraffic is somehow crippled, as the FTP connection cannot show directory information on the NAS.
The other bootable version (Linux) Can connect normally.
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Kind regards,
Kris van der Meij
The Netherlands
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