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BackupEngine was building pendingAssets from ManifestIndex(manifest:) which only knows about files Kisani previously uploaded. When most NAS files were uploaded by other tools, nearly all phone photos passed the pending filter and "Back up again" would queue and attempt to re-upload everything. Fix: step 3b builds a filterIndex from the cached NAS directory filenames (or a fresh listDirectory scan when cache is unavailable) when the directory has more files than the manifest. The filename-based filterIndex correctly identifies only photos whose filenames are absent from the NAS, so "Back up again" queues exactly the delta — not a full library re-upload. The baseManifest/baseIndex are unchanged and still drive the manifest write. Co-Authored-By: Kutesir <kutesir@provoc.ug> Co-Authored-By: Sentry <sentry@provoc.ug>