Clonezilla and DRBL both have a server mode you can run on another computer of some kind.
Even if its a raspberry pi 4 4gb or 8gb of RAM, and and external USB 3 storage. SSD for ultimate speed.
Then you can PXE boot (pronounced pixie boot) your computer usually by pressing F11 or F12 a number of times on boot up.
Different computers may use different keys ...