diff --git a/doc/todo/onlyingroup_preferred_content_expression/comment_1_eddf28997789400398fbdd58ec64861d._comment b/doc/todo/onlyingroup_preferred_content_expression/comment_1_eddf28997789400398fbdd58ec64861d._comment
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+[[!comment format=mdwn
+ username="nobodyinperson"
+ avatar="http://cdn.libravatar.org/avatar/736a41cd4988ede057bae805d000f4f5"
+ subject="onlyingroup also useful for offline backup drives"
+ date="2023-07-31T04:40:42Z"
+ content="""
+Such an `onlyingroup` group would also be useful to match (and ignore from standard sync operations) files that are only available on hard-to-reach `offline-backup` repos, say offline backup drives or those in a safe. Normal repos can want `include=* and not onlyingroup=offline-backup` and then won't bother with unreachable files. This is an alternative to the `archive/` directory, which might be undesired or impractical to use (original file location is 'lost' when moving files into the archive).
+"""]]