If you want to move the server block by block then you’ll need to use dd over ssh. Here’s a Linode article on how to do this:

https://www.linode.com/docs/platform/disk-images/copying-a-disk-image-over-ssh/

Here you need to start a DO VM with enough storage to store the “image” you’re copying over from Linode. Once the dd transfer completes, download the resulting file and upload it as an image here in DO.

Cheers