diff --git a/site/publish.sh b/site/publish.sh
index e05c560d0..0085f1f6f 100755
--- a/site/publish.sh
+++ b/site/publish.sh
@@ -1,16 +1,26 @@
 #!/bin/bash -ex
 
+## Environment variables that could be configured at the job level:
+# - OPT_IN_SYNC_FS_R2: (optional) Set it to "optin" to also update azure.updates.jenkins.io Files Share and R2 buckets
+
 # Used later for rsyncing updates
 UPDATES_SITE="updates.jenkins.io"
 RSYNC_USER="www-data"
 
+# For syncing R2 buckets aws-cli is configured through environment variables (from Jenkins credentials)
+# https://docs.aws.amazon.com/cli/latest/userguide/cli-configure-envvars.html
+export AWS_DEFAULT_REGION='auto'
+
+## Install jq, required by generate.sh script
 wget --no-verbose -O jq https://github.com/stedolan/jq/releases/download/jq-1.5/jq-linux64 || { echo "Failed to download jq" >&2 ; exit 1; }
 chmod +x jq || { echo "Failed to make jq executable" >&2 ; exit 1; }
 
 export PATH=.:$PATH
 
+## Generate the content of 'www2' and 'download' folders
 "$( dirname "$0" )/generate.sh" ./www2 ./download
 
+## 'download' folder processing
 # push plugins to mirrors.jenkins-ci.org
 chmod -R a+r download
 rsync -avz --size-only download/plugins/ ${RSYNC_USER}@${UPDATES_SITE}:/srv/releases/jenkins/plugins
@@ -19,8 +29,117 @@ rsync -avz --size-only download/plugins/ ${RSYNC_USER}@${UPDATES_SITE}:/srv/rele
 ssh ${RSYNC_USER}@${UPDATES_SITE} "cat > /tmp/update-center2-rerecent-releases.json" < www2/experimental/recent-releases.json
 ssh ${RSYNC_USER}@${UPDATES_SITE} "/srv/releases/sync-recent-releases.sh /tmp/update-center2-rerecent-releases.json"
 
-# push generated index to the production servers
-# 'updates' come from tool installer generator, so leave that alone, but otherwise
-# delete old sites
+## 'www2' folder processing
 chmod -R a+r www2
-rsync -acvz www2/ --exclude=/updates --delete ${RSYNC_USER}@${UPDATES_SITE}:/var/www/${UPDATES_SITE}
+
+function parallelfunction() {
+    echo "=== parallelfunction: $1"
+
+    case $1 in
+    rsync*)
+        # Push generated index to the production server
+        time rsync --archive --checksum --verbose --compress \
+            --exclude=/updates `# populated by https://github.com/jenkins-infra/crawler` \
+            --delete `# delete old sites` \
+            --stats `# add verbose statistics` \
+            ./www2/ "${RSYNC_USER}@${UPDATES_SITE}:/var/www/${UPDATES_SITE}"
+        ;;
+
+    azsync*)
+        # Script stored in /usr/local/bin used to generate a signed file share URL with a short-lived SAS token
+        # Source: https://github.com/jenkins-infra/pipeline-library/blob/master/resources/get-fileshare-signed-url.sh
+        fileShareUrl=$(get-fileshare-signed-url.sh)
+        # Sync Azure File Share content using www3 to avoid symlinks
+        time azcopy sync ./www3/ "${fileShareUrl}" \
+            --recursive=true \
+            --exclude-path="updates" `# populated by https://github.com/jenkins-infra/crawler` \
+            --delete-destination=true
+        ;;
+
+    s3sync*)
+        # Retrieve the R2 bucket and the R2 endpoint from the task name passed as argument, minus "s3sync" prefix
+        updates_r2_bucket_and_endpoint="${1#s3sync}"
+        r2_bucket=${updates_r2_bucket_and_endpoint%|*}
+        r2_endpoint=${updates_r2_bucket_and_endpoint#*|}
+
+        # Sync CloudFlare R2 buckets content excluding 'updates' folder from www3 sync (without symlinks)
+        # as this folder is populated by https://github.com/jenkins-infra/crawler/blob/master/Jenkinsfile
+        time aws s3 sync ./www3/ "s3://${r2_bucket}/" \
+            --no-progress \
+            --no-follow-symlinks \
+            --size-only \
+            --exclude '.htaccess' \
+            --endpoint-url "${r2_endpoint}"
+        ;;
+
+    *)
+        echo -n 'Warning: unknown parameter'
+        ;;
+
+    esac
+}
+
+# Export local variables used in parallelfunction
+export UPDATES_SITE
+export RSYNC_USER
+
+# Export variables used in parallelfunction/azsync/get-fileshare-signed-url.sh
+export STORAGE_FILESHARE=updates-jenkins-io
+export STORAGE_NAME=updatesjenkinsio
+export STORAGE_DURATION_IN_MINUTE=5 # duration of the short-lived SAS token
+export STORAGE_PERMISSIONS=dlrw
+
+# Export function to use it with parallel
+export -f parallelfunction
+
+# parallel added within the permanent trusted agent here:
+# https://github.com/jenkins-infra/jenkins-infra/blob/production/dist/profile/manifests/buildagent.pp
+command -v parallel >/dev/null 2>&1 || { echo 'ERROR: parralel command not found. Exiting.'; exit 1; }
+
+# Sync only updates.jenkins.io by default
+tasks=('rsync')
+
+# Sync updates.jenkins.io and azure.updates.jenkins.io File Share and R2 bucket(s) if the flag is set
+if [[ ${OPT_IN_SYNC_FS_R2} == 'optin' ]]
+then
+    # TIME sync, used by mirrorbits to know the last update date to take in account
+    date +%s > ./www2/TIME
+
+    ## No need to remove the symlinks as the `azcopy sync` for symlinks is not yet supported and we use `--no-follow-symlinks` for `aws s3 sync`
+    # Perform a copy with dereference symlink (object storage do not support symlinks)
+    rm -rf ./www3/ # Cleanup
+    
+    rsync --archive --verbose \
+        --copy-links `# derefence symlinks` \
+        --safe-links `# ignore symlinks outside of copied tree` \
+        --exclude='updates' `# Exclude ALL 'updates' directories, not only the root /updates (because symlink dereferencing create additional directories` \
+        ./www2/ ./www3/
+
+    # Add File Share sync to the tasks
+    tasks+=('azsync')
+
+    # Add each R2 bucket sync to the tasks
+    updates_r2_bucket_and_endpoint_pairs=("westeurope-updates-jenkins-io|https://8d1838a43923148c5cee18ccc356a594.r2.cloudflarestorage.com")
+    for r2_bucket_and_endpoint_pair in "${updates_r2_bucket_and_endpoint_pairs[@]}"
+    do
+        tasks+=("s3sync${r2_bucket_and_endpoint_pair}")
+    done
+fi
+
+echo '----------------------- Launch synchronisation(s) -----------------------'
+parallel --halt-on-error now,fail=1 parallelfunction ::: "${tasks[@]}"
+
+# Wait for all deferred tasks
+echo '============================ all done ============================'
+
+# Trigger a mirror scan on mirrorbits if the flag is set
+if [[ ${OPT_IN_SYNC_FS_R2} == 'optin' ]]
+then
+    echo '== Triggering a mirror scan on mirrorbits...'
+    # Kubernetes namespace of mirrorbits
+    mirrorbits_namespace='updates-jenkins-io'
+
+    # Requires a valid kubernetes credential file at $KUBECONFIG or $HOME/.kube/config by default
+    pod_name=$(kubectl --namespace="${mirrorbits_namespace}" --no-headers=true get pod --output=name | grep mirrorbits | head -n1)
+    kubectl --namespace="${mirrorbits_namespace}" --container=mirrorbits exec "${pod_name}" -- mirrorbits scan -all -enable -timeout=120
+fi