You wont loose any data but you will need too move your web contents and databases manually from your end. Make sure that you download your emails as moving those would be difficult. There''s no automated procedure to move windows accounts so you will need to do it manually.
Simply open a ticket and ask the support team to create a new account for you on HC7. Once you move your data you can ask our team to change the DNS information of your domain name and your
website hosting will start working from HC7 server.