Download ISO image from [https://www.debian.org/distrib/netinst]. Find out the name of the USB drive using the lsblk tool. On most Linux distributions the USB flash drive will be automatically mounted when inserted. Unmount the USB partitions first.

# lsblk
# umount /dev/sdx1
# dd bs=4M if=/path/to/debian-XX.X.X-amd64-netinst.iso of=/dev/sdx status=progress oflag=sync

To collect config files, etc.

rsync -aAXz --verbose --itemize-changes --times --recursive --whole-file --delete --links --exclude dev/* --exclude proc/* --exclude sys/* --exclude tmp/* --exclude run/* --exclude mnt/* --exclude media/* --exclude lost+found --exclude var/lib/lxcfs/cgroup/* --exclude var/lib/lxcfs/proc/* / /media/oscar/Sandisk8GB

sudo apt install bluez blueman