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diff --git a/archmirror-sync.sh b/archmirror-sync.sh
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+#!/usr/bin/env bash
+set -euo pipefail
+
+# ====== CONFIG ======
+# Pick a nearby Tier-1. Examples (use ONE):
+#   rsync://mirror.csclub.uwaterloo.ca/archlinux/
+#   rsync://mirror.constant.com/archlinux/
+UPSTREAM="${UPSTREAM:-rsync://mirror.csclub.uwaterloo.ca/archlinux/}"
+
+# Local paths
+LIVE="${LIVE:-/brimstone1/mirror/archlinux}"          # served path (symlink target)
+STAGE="${STAGE:-/brimstone3/mirror-stage/archlinux}"  # staging path
+LOGDIR="${LOGDIR:-/var/log/mirrors}"
+LOCK="${LOCK:-/var/log/archmirror.lock}"
+
+# rsync knobs
+RSYNC_OPTS=(
+  -rtlH --safe-links
+  --delete-delay --delay-updates
+  --partial --partial-dir=.rsync-partial
+  --timeout=600 --contimeout=60
+)
+
+# Niceness (be kind to disks)
+IONICE=(ionice -c2 -n7)
+NICE=(nice -n 15)
+
+mkdir -p "$STAGE" "$LIVE" "$LOGDIR"
+exec 9>"$LOCK"
+flock -n 9 || { echo "[$(date -Is)] another archmirror-sync is running, exiting"; exit 0; }
+
+log() { echo "[$(date -Is)] $*"; }
+log "starting sync from $UPSTREAM"
+
+# First pass
+"${IONICE[@]}" "${NICE[@]}" rsync "${RSYNC_OPTS[@]}" \
+  "$UPSTREAM" "$STAGE" | tee -a "$LOGDIR/arch-sync.log"
+
+# Quick second pass to catch files updated mid-run
+"${IONICE[@]}" "${NICE[@]}" rsync "${RSYNC_OPTS[@]}" \
+  "$UPSTREAM" "$STAGE" | tee -a "$LOGDIR/arch-sync.log"
+
+# Atomic flip: make LIVE point at STAGE (symlink strategy)
+# If LIVE is a directory you want to replace, serve via a symlink path like /srv/mirror/arch -> /srv/mirror-stage/arch
+ln -sfn "$STAGE" "$LIVE"
+
+# Optional: write a local "lastsync" like Arch does, helps some clients
+date -u +%s > "$LIVE/lastsync"
+
+log "sync complete; flipped LIVE -> $STAGE"