diff --git a/kernel/model/conf.go b/kernel/model/conf.go
index 72bbe3bef..84f2ba1ff 100644
--- a/kernel/model/conf.go
+++ b/kernel/model/conf.go
@@ -780,12 +780,17 @@ func IsSubscriber() bool {
 }
 
 func IsPaidUser() bool {
+	// S3/WebDAV data sync and backup are available for a fee https://github.com/siyuan-note/siyuan/issues/8780
+
 	if IsSubscriber() {
 		return true
 	}
-	return nil != Conf.GetUser() // Sign in to use S3/WebDAV data sync https://github.com/siyuan-note/siyuan/issues/8779
-	// TODO S3/WebDAV data sync and backup are available for a fee https://github.com/siyuan-note/siyuan/issues/8780
-	// return nil != Conf.User && 1 == Conf.User.UserSiYuanOneTimePayStatus
+
+	u := Conf.GetUser()
+	if nil == u {
+		return false
+	}
+	return 1 == u.UserSiYuanOneTimePayStatus
 }
 
 const (