TO ALL USERS: New feature proposal: Avoid redundant backup of renamed files. in Product Suggestions-Windows Posted July 3, 2017 · Edited October 18, 2018 by DavidHertzberg Wikipedia article has been significantly re-edited, but an old version was saved in which the paragraph with the bulleted items was deleted from the linked-to section · Report reply I think Ash7 is assuming that each Snapshot entry for a file now contains the concatenated names of each of its enclosing directories. I doubt that's true, because it would make each Snapshot entry very lengthy, and therefore the total size of a Snapshot very large. Instead I suspect each Snapshot entry contains the concatenated entry-numbers-within-parent-directory of each of its enclosing directories. Ash7 should take a careful look at pages 30-31 of the Retrospect Windows 12 User's Guide, and decide what he/she thinks "A Snapshot is a list—you can think of it as a picture—of all files and folders on a volume when it is backed up" means. If I'm right, it would explain why Retrospect Inc. has not already implemented what Ash7 proposes—even as an option. Note that the fifth paragraph of this section of the old Wikipedia article starts out "Retrospect does file-level deduplication, patented as IncrementalPLUS." DavidBenAvraham's reference for that is page 21 of the Retrospect Mac 6 User's Guide, the oldest UG available on the Retrospect.com website. Although Dantz Development Corp.'s patent has surely expired by now, you can't—at least you're not supposed to—get a U.S. software patent for something that is "obvious ... to a person having ordinary skill in the art to which the claimed invention pertains". I suspect that what made IncrementalPLUS patentable is something rather tricky involving the Snapshot and Catalog File. P.S.: Expanded second paragraph with evidence that Snapshots are trickier than Ash7 may think.