Previously we use to face problems due to loss of MySQL Server data or emails of customers so this time we were focussed on ensuring that nothing is lost in this transfer process and customers should find their
website hostings on a server which is above their expectations.
I will make sure that we keep FTP information as well on our checklist when something similar is done in future. I don't think you should worry for next 2 years as my experience says that we need to replace servers or hardware after 2 years but we have expertise in moving data and most of the times we mirror a new server with old server and simultaneously IP addresses are swapped on both server to bring the new server back online with same IPs and everything as it is except hardware configuration.