Absolutely! Upgrade/downgrade your server at any time and pay onlt the difference at a prorated amount. Upgrades can be done automatically in the client area.
Absolutely! We do have lifetime plans, all you have to do is open a ticket and a member of support team can get back to you on how much the lifetime plan would be however it would vairy depending on what plan you are looking at.
If your files to happen to prehaps get deleted on "accident" then you would need to upload a backup if you had created a backup, if not you may need to re develop your server.