[xwiki-users] Migrating XE from 2.4.3 to 2.7.1 and 3.0

Hi XWiki Team, Sorry if this is a recurring thread, but can't find more details on it. I'm using XE 2.4.30451 in production enviromnent on my company, and due to the numerous new functionalities of the new XWiki versions, I'm planning to migrate to 2.7.1, and after to 3.0. My question is: can I upgrade it as easy as just replacing the entire old war file with the new one (of course, with the tunings I've made on it, such as WYSIWYG macros, footnotes etc, setting the schema migration flag on xwiki.cfg? Won't I lose any of my documents, pages, attachments, comments etc at all? Of course I'll test it first, outside the production, but I would like to gather as much information I can to plan the entire migration process. We have a very large set of pages already on the wiki, and I wouldn't like to face big problems :-) Thanks in advance, Ramon Gomes Brandão