As far as I know, there isn’t a single list covering all these steps in one place, but I will try to rustle up subsets…
In the meantime, is your new-db machine still running? You can get a start on the first part by looking at volume configuration from the inside…
fly ssh console -a new-db
lsblk # mount points
df -h # sizes (GB used)
The idea will be to download the entire filesystem subtree corresponding to vdb into a single .zip file.