fix: multiple fixes; minor

main/bin/update-backups.sh

@@ -15,12 +15,14 @@ for host in $(cat /var/lib/sfbs/hosts | grep -v '#'); do
 
     echo "pulling $host's fs..."
 
-    rsync -av --delete \
+    rsync -avP --delete \
         sfbs@$host::sfbs/ \
         --link-dest "$latest_link" \
         --password-file="/var/lib/sfbs/rsync-password" \
         --include="/usr/local" \
         --exclude="/usr/*" \
+        --exclude="/lib/*" \
+        --exclude="/bin/*" \
         --exclude="/tmp/*" \
         --exclude="/sys/*" \
         --exclude="/dev/*" \