Cannot Backup my Development Instance (Fails)

Hmm it looks like this is related to

https://github.com/discourse/discourse/commit/83110a1a812140382167e8f5339c8bde3ee6610d

[2018-07-12 20:48:45] EXCEPTION: Failed to archive uploads.
tar: Option --warning=no-file-changed is not supported
Usage:
  List:    tar -tf <archive-filename>
  Extract: tar -xf <archive-filename>
  Create:  tar -cf <archive-filename> [filenames...]
  Help:    tar --help

Can you try upgrading tar to at least 1.23?

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