Can't connect to port 8007...

According to the logs you did not restore the
According to the logs, the Disk "SauvegardeUSB" is still failing:

Code:
Nov 09 11:15:48 pve pvestatd[2853]: could not activate storage 'SauvegardeUSB', zfs error: cannot import 'SauvegardeUSB': I/O error
Also, the datastore called sauvegarde seems to not have been created/moved correctly, as the system logs the following error
Code:
Nov 09 00:15:36 pve proxmox-backup-[2195562]: pve proxmox-backup-proxy[2195562]: GET /api2/json/admin/datastore/sauvegarde/status: 400 Bad Request: [client [::ffff:127.0.0.1]:58276] unable to open chunk store 'sauvegarde' at "/sauvegarde/.chunks" - No such file or directory (os error 2)

Was the datastore located on the USB disk before? Did you try to move the datastore of the USB disk?

Regarding your connection issue, what is the status of the api and proxy service? Please post the output of systemctl status proxmox-backup.service proxmox-backup-proxy.service. Are you able to connect via curl from localhost, e.g. curl -v -k https://localhost:8007 executed on the PBS host?