Wiki.Cyli.Org

This starts after the Basic Setup and continues to use Jeff Geerlings version of rpi-clone. Make sure the 'Pi is up-to-date, run sudo apt update and sudo apt -y upgrade. Close out of any applications except for a terminal or SSH session.

Connect your NVME drive to the 'Pi, I used this device; Geekworm X1000 PCIe M.2 Key-M NVMe SSD PIP PCIe Peripheral Board for Raspberry Pi 5

echo "dtparam=pciex1_gen=3" | sudo tee -a /boot/firmware/config.txt

sudo reboot

After the machine restarts;

curl https://raw.githubusercontent.com/geerlingguy/rpi-clone/master/install | sudo bash
sudo rpi-eeprom-config --edit
#   I set my boot order to 461 so I can install an SD card and boot off that easily if I need to.
#   Below isn't commented, just showing what mine looks like.
# [all]
# BOOT_UART=1
# POWER_OFF_ON_HALT=0
# BOOT_ORDER=0xf461

sudo rpi-clone nvme0n1
# Answer the questions asked, they should make sense...