Your best bet is to create an image or backup in linode-cli if you are comfortable with cli. make sure you have pip3 installed and then run pip3 install linode-cli --upgrade

To create image to be exported to google cloud, run

linode-cli images create \
  --label this_is_your_label \
  --description "My linode image-backup" \
  --disk_id 123

When prompted for PAT follow this guide. This image would move all your files and environment off linode. Good practice to shutdown server when creating backup so there won't be interference with some apps running in background.