Hi,
and thanks for your answer.
For the printer issue : I am using a Brother MFC-L8690CDW, which is plugged on Ethernet to my router, but Qubes is on another Internet Provider router… I tried to install the packages for Brother with a file that does install scanner and printer drivers, but it cannot connect to the IP address, and I noticed some failures during the installation.
I installed a fresh SSD in the computer (and followed as described the tutorial to add a second storage) and would like to use it as storage of Qubes VMs (if you could tell me how to clone the ones I created to this fresh SSD, I would be grateful) and, if possible, as a normal storage to put some extra datas.