Since zotero stores everything in a directory which is contained within your Firefox profile, selecting FEBE's option to "back up entire profile" should back up everything within Zotero including all attachments, metadata, notes and highlights.
You can also do it with any other backup tool. As discussed in some ... previous posts. Everything is in the zotero directory. The important things are the zotero.sqlite file which contains all of you data and notes, and the /storage directory, which contain your attachments.
Upgrade Storage
You can also do it with any other backup tool. As discussed in some ... previous posts. Everything is in the zotero directory. The important things are the zotero.sqlite file which contains all of you data and notes, and the /storage directory, which contain your attachments.