When a laptop goes to a new owner, the drive inside it holds everything you ever did. A clone to a spare disk keeps your files, your settings, and your licence while letting you hand over clean hardware.
This guide explains how to make that copy, what to erase afterwards, and which mistakes leave your accounts exposed to the next user.
The order matters: copy first, erase second. Erasing a disk that was never copied is the mistake that turns a sale into a data loss.

A cheap enclosure is fine for an archive, but check that it does not drop under sustained writes. A copy that fails at 80 percent wastes the whole evening.

BitLocker is the one that catches people out. A copied encrypted disk is useless without the recovery key, so export it to your account before you start.
Qiling Disk Master writes an exact copy of the laptop disk to the external target. The machine keeps working during the copy, so finish any last task before you begin.
Watch the video tutorial below to clone the drive step by step with Qiling Disk Master.
Step 1. Open Qiling Disk Master, choose Clone, and then select Disk Clone.

Step 2. Select the laptop system disk as the source and click Next.

Step 3. Select the external disk as the destination and confirm that its data will be replaced.

Step 4. Keep every partition, including the EFI and recovery volumes, and tick Optimize for SSD if the target is solid state.

Step 5. Click Proceed, wait for the copy to finish, then eject the external disk safely.

If the buyer wants the drive included, a full reset with the remove-everything option is the minimum. A secure erase is better, and physically keeping the disk is best.
Yes. The copy runs while Windows works, and the laptop is unchanged afterwards.
The digital licence stays with the hardware, so it does not travel with the copy.
For most buyers, yes after a full reset. For sensitive data, wipe the drive or keep it.
Not after a full reset or a secure erase. A quick format leaves recoverable traces.
Either works. A spare SSD is faster, a large HDD is cheaper for an archive.
A clone is a copy of the disk, not a backup of your choices. Take a system image as well, so you can restore the machine if the sale falls through.
Watch the video tutorial below to back up Windows and restore it if the clone fails.
Step 1. Open Qiling Disk Master and select System Backup to include the boot partitions.

Step 2. Save the image to a drive other than the target disk and start the backup.

Step 3. Click Proceed to start the system backup and wait patiently until it finishes. You can also tick Shut down the computer when the operation is completed to power off automatically.

Step 4. If the sale is cancelled, restore the image to the laptop and the machine returns to its old state.

Clone the laptop disk before you erase it, and keep the copy on a drive that leaves with you. Suspend encryption, export the recovery key, test the copy, and only then reset or wipe the original. If the drive itself goes to the buyer, a secure erase is the difference between a clean sale and a data leak.
For more on moving a Windows setup, see How to Clone Windows 11 to a New Laptop, Easily Migrate Windows 10 from One PC to Another, How to Clone Windows 11 to an External SSD, and How to Clone a BitLocker-Encrypted Drive.