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Since you say maximum storage in database, I presume that you are asking about the limits in terms of submissions data.
If that is true, there are no limits in how much data you can store per one submission nor how many submissions you can have.
I would also like to point out that Professional plan allows you to do a lot per month, but that we have bigger plans available as well in case that becomes needed.
We look to have a system that will do as much for you as possible so that you do not have to think about that, just have it ready for usage.
Also I am not quite sure what you mean by version? If you mean on different plan, then the answer would be that all of our plans are limited to the number of submissions per month and the storage space available to your account, all of which you can see on our pricing page.
Do let us know if you have any additional question in regards to this.