sh.zio.backup: add message for rescue

usr/local/bin/sh.zio.backup

@@ -295,11 +295,14 @@ if [[ -z "$1" || -f "$1" ]]; then
         | sed -E ":begin;$!N;s/$(basename "$0")\n\s+?//;tbegin;P;D"
 elif [[ "$1" == "rescue" ]]; then
     snapshot="$2"
+    rescue_dir="/srv/dumps/$host/restic/$snapshot"
 
     [[ -z "$snapshot" ]] && die "No snapshot ID provided"
 
+    say info "Rescuing: $snapshot (to '$rescue_dir')"
+
     invoke_restic restore \
-        --target "/srv/dumps/$host/restic/$snapshot" \
+        --target "$rescue_dir" \
         "$snapshot"
 elif [[ "$1" == "toggle-mount" ]]; then
     function test_restic_mount() {