config: has_feature() take default for backup into account

diff --git a/PVE/QemuConfig.pm b/PVE/QemuConfig.pm
index 692bba88722b7cad5d3a11d5a87f38ab3b44ed5e..8e56d33ab60429840a2e58a86a70d4a7a15bcb54 100644 (file)
--- a/PVE/QemuConfig.pm
+++ b/PVE/QemuConfig.pm
@@ -55,7 +55,7 @@ sub has_feature {
        my ($ds, $drive) = @_;
 
        return if PVE::QemuServer::drive_is_cdrom($drive);
-       return if $backup_only && !$drive->{backup};
+       return if $backup_only && defined($drive->{backup}) && !$drive->{backup};
        my $volid = $drive->{file};
        $err = 1 if !PVE::Storage::volume_has_feature($storecfg, $feature, $volid, $snapname, $running);
    });