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Move to Secure Boot > Secure Boot Enable and deselect Secure Boot Enable.
Move to General > Boot Sequence and click on Add new XY. Choose a name, select the file /EFI/boot/grubXY.cfg and confirm it. (Depending on the used Clonezilla version and the underlying BIOS the needed file and its path differ. For more information see here.) Move Clonezilla to the highest priority, apply the changes and exit. After rebooting, Clonezille should start.

Navigate through Clonezilla

Tip
If you want to exit Clonezilla in the start menu, switch to console by entering "c" and then enter "exit". (The next OS specified in the Boot Sequence of the BIOS will start.)

After Clonezilla has been started successfully, you have to navigate through the "submenus" it consists of. Choose

the first option Clonezilla live (Default settings, VGA 800x600). If you don't do anything this will be chosen automatically after plenty of seconds.
the language and the keyboard layout as you want (default recommended).
start Clonezilla
device-device
expert
disk to local disk
the source as identified in the beginning
the target as identified in the beginning
toggle the options as follows by using Space. Deactivate everything except the next two options which should be set:
- sector-by-sector copy (-q1)
- inspect checksums (-cmf)
keep default (skip checking/repairing source file system)
keep default (use the partition table from the source disk)
poweroff

Warning
All data, which was saved at the target device, will be lost afterwards!

Finally, confirm everything (warnings, and clone of boot loader) with y.

Depending on the size of the devices the cloning process will take up to a few hours.