diff --git a/sandboxd/pool/pool.go b/sandboxd/pool/pool.go
index 9232839..f0c2441 100644
--- a/sandboxd/pool/pool.go
+++ b/sandboxd/pool/pool.go
@@ -265,6 +265,9 @@ func NewManager(ctx context.Context, cfg *config.Config, eng Engine) (*Manager,
 			m.archiveEnabled = true
 		}
 	}
+	if m.archiveEnabled && m.ckptTTL == 0 {
+		log.WithFunc("pool.NewManager").Warn(ctx, "archive enabled with checkpoint_ttl_hours=0: a checkpoint whose delete fails is not reclaimed")
+	}
 	return m, nil
 }