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For externally stored data the visible 'command output' in the GUI is made up from the size and the SHA256 checksum of the contents, and change detection (and the GUI) uses this data instead of the (possibly binary or huge) file contents. This produces much more coarse change detection, but works with binary files. In the GUI you'll see the made up 'command output', and a button to download the actua actual contents.
All other opConfig capabilities work normally for externally stored data; e.g. scheduling, tags, purging of old revisions, revision creation itself and so on.
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