Export Your Data Transparently
When you add your documents and clippings to DEVONthink, you're never locked in. DEVONthink provides you with a variety of export options based on standard file formats, not obscure XML constructs or even proprietary file formats. Whatever you store in DEVONthink, you'll get it out in exactly that format again.
To export documents as standard files, select them in your DEVONthink database and select File > Export > As Files and Folders. DEVONthink recreates the group structure in your database as closely as possible, additional metadata is added in the form of harmless 'DEVONthink_storage' files (simple text files).
Alternatively, DEVONthink can export your documents in a number of formats that require conversion, e.g. as pure text, rich text, or OPML. Multiple selected email messages can also be exported in the standard Unix mailbox format. You can find all export options in the File > Export sub-menu.
Additional tip: DEVONthink Pro and Pro Office also offer a number of convenient scripts for exporting your data e.g. as a backup archive that contains all your documents in their original file formats, i.e. DEVONthink-independent. You can find them in Scripts > Export (note: the Scripts menu shows a stylized 'S' instead of the word 'Scripts').