Currently, VersionPress is in an Early Access phase. We increase major version numbers quite rapidly, e.g., VersionPress is at 3.0 at the time of writing this, but that does not mean it is production-ready. As long as this Early Access notice is here, you have to be careful.
Ideally, use VersionPress for testing / dev purposes only. Local, throw-away sites and workflows are ideal.
If you're going to run VersionPress on a live site, keep backup at all times. We really mean this. VersionPress manipulates the database during some operations and can break it if it interferes with some other plugin or has a bug in it.
Compatibility with 3rd party plugins and themes is often problematic. Generally, plugins with custom database data need special attention and are a long-term challenge. This is explained on the external plugins page in more detail.
Be familiar with WordPress and Git. VersionPress at the Early Access stage is not suitable for non-technical users.
You can tell whether you are using an Early Access release of VersionPress from the top admin bar where there is a clear warning.
Between January 2015 and March 2016, VersionPress used to be available through Early Access Program (EAP). It was discontinued when VersionPress moved to a fully open development model on GitHub.
We're leaving this note here in case you encounter "EAP" somewhere, e.g., in this page's URL :smile:.