diff --git a/adhoc/normalize_gcs_archive.sh b/adhoc/normalize_gcs_archive.sh
new file mode 100755
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+++ b/adhoc/normalize_gcs_archive.sh
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+#!/bin/bash
+#
+# normalize_gcs_archive.sh is a single-use script that will sync legacy
+# datatypes from the <exp>/YYYY pattern to <exp>/<datatype>/YYYY pattern.
+#
+# New data is not being added to the legacy locations. So, running rsync once
+# should be sufficient. However, the steps below run it twice to guarantee that
+# all data is in place.
+#
+# Steps:
+# * rsync data from old to new locations (slow)
+# * delete exits below.
+# * rsync again to confirm all data is copied (faster)
+# * remove data from old locations (slower)
+
+
+set -e
+set -x
+
+archive=${1:?Please provide GCS bucket name, e.g. archive-mlab-sandbox}
+
+function assert_src_files_found_in_dst() {
+  local src=$1
+  local dst=$2
+
+  # We cannot compare the files directly b/c the object paths have changed.
+  # Extract just the archive name from the last path component.
+  awk -F/ '{print $NF}' $src | sort > src.files
+  awk -F/ '{print $NF}' $dst | sort > dst.files
+
+  # Report files that are unique to the src. There should be zero.
+  c=`comm -2 -3 src.files dst.files | wc -l`
+  if [[ $c != "0" ]]; then
+    echo "FAILURE:"
+    comm -2 -3 src.files dst.files
+    return 1
+  else
+    echo "SUCCESS: all files from $src found in $dst"
+    return 0
+  fi
+}
+
+function safe_rsync() {
+  local src=$1
+  local dst=$2
+
+  # List all files in the src, to compare to all files in dst at the end.
+  time gsutil ls $src > src.raw
+  # Perform copy.
+  time gsutil -m rsync -r $src $dst
+  # List all files in the dst (which should include src files now).
+  time gsutil ls $dst > dst.raw
+  # Assert that the src files are found in the dst files.
+  assert_src_files_found_in_dst src.raw dst.raw
+}
+
+# NOTE: This will take a very long time. Each "safe_rsync" performs several steps:
+# * list files in src
+# * run rsync
+# * list files in dst
+# * verify that src files are found in dst.
+
+# NDT web100
+for year in 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 ; do
+  safe_rsync gs://${archive}/ndt/${year}/ gs://${archive}/ndt/web100/${year}/
+done
+
+# Sidestream web100
+for year in 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 ; do
+  safe_rsync gs://${archive}/sidestream/${year}/ gs://${archive}/host/sidestream/${year}/
+done
+
+# Paris-traceroute
+for year in 2013 2014 2015 2016 2017 2018 2019 ; do
+  safe_rsync gs://${archive}/paris-traceroute/${year}/ gs://${archive}/host/traceroute/${year}/
+done
+
+# Switch
+for year in 2016 2017 2018 2019 ; do
+  safe_rsync gs://${archive}/switch/${year}/ gs://${archive}/utilization/switch/${year}/
+done
+
+# TODO: wait until ndt-server creates the single ndt7 directory name.
+# i.e. https://github.com/m-lab/ndt-server/pull/264 is in production.
+for year in 2019 2020 ; do
+  # NDT7 Upload / Download
+  safe_rsync gs://${archive}/ndt/ndt7/upload/${year}/ gs://${archive}/ndt/ndt7/${year}/
+  safe_rsync gs://${archive}/ndt/ndt7/download/${year}/ gs://${archive}/ndt/ndt7/${year}/
+done
+
+# Delete exits to proceed to remove legacy folders.
+exit 0
+exit 0
+exit 0
+exit 0
+
+
+################################################################################
+# REMOVE
+################################################################################
+
+# NDT web100
+for year in 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 ; do
+  time gsutil -m rm -r gs://${archive}/ndt/${year}/
+done
+
+# Sidestream web100
+for year in 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 ; do
+  time gsutil -m rm -r gs://${archive}/sidestream/${year}/
+done
+
+# Paris-traceroute
+for year in 2013 2014 2015 2016 2017 2018 2019 ; do
+  time gsutil -m rm -r gs://${archive}/paris-traceroute/${year}/
+done
+
+# Switch
+for year in 2016 2017 2018 2019 ; do
+  time gsutil -m rm -r gs://${archive}/switch/${year}/
+done
+
+# TODO: wait until ndt-server creates the single ndt7 directory name.
+# i.e. https://github.com/m-lab/ndt-server/pull/264 is in production.
+for year in 2019 2020 ; do
+  # NDT7 Upload / Download
+  time gsutil -m rm -r gs://${archive}/ndt/ndt7/upload/${year}/
+  time gsutil -m rm -r gs://${archive}/ndt/ndt7/download/${year}/
+done