diff --git a/docker/routlin-dash/app/config_utils.py b/docker/routlin-dash/app/config_utils.py
index 6107d65..1604b42 100644
--- a/docker/routlin-dash/app/config_utils.py
+++ b/docker/routlin-dash/app/config_utils.py
@@ -404,6 +404,7 @@ def revert_snapshot_to_config(entry_uuid):
         before=after, after=before,
         description=f"Reverted: {snap.get('description', '')}",
         cmd=snap.get('cmd', 'core apply'),
+        reverts=entry_uuid,
     )
     return msg or 'Reverted.', True
 
@@ -421,7 +422,7 @@ def load_snapshot_for_uuid(entry_uuid):
 
 
 def save_config_with_snapshot(new_config, path, key, operation, before, after,
-                             description='', cmd='core apply', queue=True):
+                             description='', cmd='core apply', queue=True, reverts=None):
     """
     Write a .snapshots/{ts}-{uuid}.json file, save new_config to disk, and
     optionally create a pending queue entry.  Returns a flash message string.
@@ -448,6 +449,7 @@ def save_config_with_snapshot(new_config, path, key, operation, before, after,
         'before':      before,
         'after':       after,
         'depends_on':  depends_on,
+        'reverts':     reverts,
     }
     with open(os.path.join(SNAPSHOTS_DIR, f'{entry_ts}-{entry_uuid}.json'), 'w') as f:
         json.dump(snapshot, f, indent=2)
diff --git a/docker/routlin-dash/app/view_page.py b/docker/routlin-dash/app/view_page.py
index c65a6bd..4f1bc2c 100644
--- a/docker/routlin-dash/app/view_page.py
+++ b/docker/routlin-dash/app/view_page.py
@@ -632,6 +632,14 @@ def collect_tokens():
     all_snaps   = load_all_snapshots()
     done_ts_map = get_done_timestamps()
     if all_snaps:
+        # UUIDs that cannot be reverted: revert entries themselves, and entries
+        # that have already been reverted (referenced in another snap's 'reverts').
+        _no_revert = set()
+        for _s in all_snaps:
+            if _s.get('operation') == 'revert':
+                _no_revert.add(_s.get('uuid', ''))
+                if _s.get('reverts'):
+                    _no_revert.add(_s['reverts'])
         hist_rows = ''
         _hist_onclick = (
             'onclick="if(event.target.type!==\'checkbox\')'
@@ -650,8 +658,9 @@ def collect_tokens():
                           f'<span class="tl-min">{e(_uuid[:8])}</span>'
                           f'</span></div>')
             snap_user  = e(snap.get('user', ''))
+            _cb_attrs  = 'disabled title="Cannot revert"' if _uuid in _no_revert else ''
             hist_rows += (f'<tr class="row-expandable" data-uuid="{e(_uuid)}" {_hist_onclick}>'
-                          f'<td class="table-cell"><input type="checkbox" name="selected_uuids" value="{e(_uuid)}"/></td>'
+                          f'<td class="table-cell"><input type="checkbox" name="selected_uuids" value="{e(_uuid)}" {_cb_attrs}/></td>'
                           f'<td class="table-cell">{e(dt_str)}</td>'
                           f'<td class="table-cell">{snap_desc}</td>'
                           f'<td class="table-cell">{_render_snap_val(before_val)}</td>'
@@ -662,7 +671,7 @@ def collect_tokens():
                           f'{_snap_expand_row(before_val, after_val, 7)}')
         select_all = (
             '<input type="checkbox" '
-            'onchange="document.querySelectorAll(\'[name=selected_uuids]\').forEach(c=>c.checked=this.checked)"/>'
+            'onchange="document.querySelectorAll(\'[name=selected_uuids]:not(:disabled)\').forEach(c=>c.checked=this.checked)"/>'
         )
         history_html = (
             '<table class="data-table">'
diff --git a/routlin/install.py b/routlin/install.py
index bdb0928..105abb8 100644
--- a/routlin/install.py
+++ b/routlin/install.py
@@ -37,6 +37,7 @@ DASHB_LOCK_FILE          = SCRIPT_DIR / ".dashboard-lock"
 DASHB_PENDING_FILE       = SCRIPT_DIR / ".dashboard-pending"
 DASHB_SCRIPT_FILE        = SCRIPT_DIR / "do_dashboard_queue.sh"
 HEALTH_FILE              = SCRIPT_DIR / ".health"
+SNAPSHOTS_DIR            = SCRIPT_DIR / ".snapshots"
 
 # Dashboard systemd timer
 DASHB_TIMER_NAME         = f"{PRODUCT_NAME}-dashboard-queue"
@@ -347,12 +348,15 @@ def setup_docker_compose(reuse_config=False):
 
 
 def create_dotfiles():
+    dir_stat = SCRIPT_DIR.stat()
+    uid, gid = dir_stat.st_uid, dir_stat.st_gid
+    if not SNAPSHOTS_DIR.exists():
+        SNAPSHOTS_DIR.mkdir()
+        os.chown(SNAPSHOTS_DIR, uid, gid)
     for f in (DASHB_QUEUE_FILE, DASHB_DONE_FILE, DASHB_LAST_RUN_FILE, DASHB_LOCK_FILE, DASHB_PENDING_FILE, HEALTH_FILE):
         if not f.exists():
             f.touch()
-            # chown to the routlin dir owner so the timer can write
-            stat = SCRIPT_DIR.stat()
-            os.chown(f, stat.st_uid, stat.st_gid)
+            os.chown(f, uid, gid)
 
 
 # ===================================================================