diff --git a/btrbk b/btrbk
index 990cc13..4ae890f 100755
--- a/btrbk
+++ b/btrbk
@@ -5497,30 +5497,28 @@ MAIN:
   }
 
   # check for duplicate snapshot locations
-  my %snapshot_check;
-  my %backup_check;
   foreach my $sroot (vinfo_subsection($config, 'volume')) {
     foreach my $svol (vinfo_subsection($sroot, 'subvolume')) {
       # check for duplicate snapshot locations
       my $snaproot = vinfo_snapshot_root($svol);
       my $snapshot_basename = config_key($svol, "snapshot_name") // die;
-      my $snapshot_target = $sroot->{URL_PREFIX} . ($realpath_cache{$snaproot->{URL}} // $snaproot->{PATH}) . '/' . $snapshot_basename;
-      if(my $prev = $snapshot_check{$snapshot_target}) {
-        ERROR "Subvolume \"$prev\" and \"$svol->{PRINT}\" will create same snapshot: ${snapshot_target}.*";
+      my $snaproot_subdir_path = (defined($snaproot->{NODE_SUBDIR}) ? $snaproot->{NODE_SUBDIR} . '/' : "") . $snapshot_basename;
+      if(my $prev = $snaproot->{node}->{_SNAPSHOT_CHECK}->{$snaproot_subdir_path}) {
+        ERROR "Subvolume \"$prev\" and \"$svol->{PRINT}\" will create same snapshot: $snaproot->{PRINT}/${snapshot_basename}.*";
         ERROR "Please fix \"snapshot_name\" configuration options!";
         exit 1;
       }
-      $snapshot_check{$snapshot_target} = $svol->{PRINT};
+      $snaproot->{node}->{_SNAPSHOT_CHECK}->{$snaproot_subdir_path} = $svol->{PRINT};
 
       foreach my $droot (vinfo_subsection($svol, 'target')) {
         # check for duplicate snapshot locations
-        my $snapshot_backup_target = $droot->{URL_PREFIX} . ($realpath_cache{$droot->{URL}} // $droot->{PATH}) . '/' . $snapshot_basename;
-        if(my $prev = $backup_check{$snapshot_backup_target}) {
-          ERROR "Subvolume \"$prev\" and \"$svol->{PRINT}\" will create same backup target: ${snapshot_backup_target}.*";
+        my $droot_subdir_path = (defined($droot->{NODE_SUBDIR}) ? $droot->{NODE_SUBDIR} . '/' : "") . $snapshot_basename;
+        if(my $prev = $droot->{node}->{_BACKUP_CHECK}->{$droot_subdir_path}) {
+          ERROR "Subvolume \"$prev\" and \"$svol->{PRINT}\" will create same backup target: $droot->{PRINT}/${snapshot_basename}.*";
           ERROR "Please fix \"snapshot_name\" or \"target\" configuration options!";
           exit 1;
         }
-        $backup_check{$snapshot_backup_target} = $svol->{PRINT};
+        $droot->{node}->{_BACKUP_CHECK}->{$droot_subdir_path} = $svol->{PRINT};
       }
     }
   }