If it helps, I moved a mail server that's been running on a 2GB Linode vm for the last two years over to a 4GB DO vm and so far (~4 weeks in) it's been problem

If it helps, I moved a mail server that's been running on a 2GB Linode vm for the last two years over to a 4GB DO vm and so far (~4 weeks in) it's been problem free (in the Amsterdam DC).