All your data from "Bitrix24" will be transferred to a self-hosted version without loss.
Self-hosted version is established on your server which is placed in your company or hosting provider.
In addition to opportunities of a cloud services, with a self-hosted version you will be able to automate business processes in your company, to integrate your enterprise portal with different services and to make many other things.
For data migration from cloudy on a self-hosted version you can address our partners.
From the cloudy version you can pass to the "BizPace" or "BizPace Enterprize" version. A difference between editions - in functionality. Choose one of these editions together with the partner.
Each edition of a self-hosted version included about 25 users. If you use rates of "Bitrix24" with unrestricted number of users, you will need to buy in addition necessary number of users for a self-hosted.
The self-hosted version works at your own server. After transfer everything will look in the same way as in your cloudy "Bitrix24". In addition you will be able to adjust logic of work of a product and design.