Of course! You can downgrade & upgrade your Minecraft Server to any plan at anytime during the service period. You will only be paying a difference which is given at a prorated cost. Once payment is made upgrades are automatically applied and requires a server restart afterwards.
Yes it is! Once payment is made your service will be automatically activated. In extreme rare cases the system would see the payment and leave it to us to verify, but otherwise if you see the service pending ten (10) minutes please do create a ticket right away to have it sorted out.
It sure is possible! We do have a SFTP/FTP Support on our panel therefore you can easy create a backup on your previous host, upload the backup to our servers with your SFTP/FTP Client and unarchive the backup and there you go!