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How to back up and wipe your Windows PC
Your old Windows PC should be wiped before you get rid of it.
Click the gear icon (top right) to change the location of the Google Drive folder on your system and to manage settings such as screenshot backups. The cloud option typically takes longer because you’re waiting for 4GB of data to download, but it does mean you’ve got the latest version of Windows — you won’t need to then apply any further updates. Note that if you’ve opted for Remove everything, selecting Change settings also lets you choose to Clean data, which isn’t done by default — if you want to enable this, flip the toggle from No to Yes.
Or read this on The Verge