diff --git a/hosts/skydick/datapool.nix b/hosts/skydick/datapool.nix
index ee737e7..5546d9b 100644
--- a/hosts/skydick/datapool.nix
+++ b/hosts/skydick/datapool.nix
@@ -375,8 +375,11 @@
         "directory mask" = "0750";
       };
 
-      # macOS Time Machine backup target
-      timemachine = {
+      # Per-user Time Machine — ldx's Macs back up here.
+      # Separate share so fruit:time machine writes sparsebundles into the
+      # dedicated ZFS dataset (dick/users/ldx/timemachine, recordsize=64K,
+      # compression=zstd) instead of polluting the files dataset.
+      "ldx-timemachine" = {
         path = "/srv/users/ldx/timemachine";
         browseable = "yes";
         "read only" = "no";