During the upgrade, you will not lose your existing storage capacity 7.75 GB. If you upgrade to RealTimes Premium subscription, you will get additional 25 GB of Cloud Space (so totally 32.75 GB). Unfortunately, the 365 GB plan has been withdrawn and it is not possible to reactivate it.
Refer this link for current pricing: http://www.real.com/pricing
Note: I wanted to let you know that we have edited your original post to remove your email address to protect your privacy. We do recommend that you refrain from posting personal information in a public Community forum.