diff --git a/src/conf/backup_conf.h b/src/conf/backup_conf.h
index c970e01920727c476260b6652fa69a39e78c5412..7cf44245d4fb94a369fdd32dc6c2e9c429f7a5c4 100644
--- a/src/conf/backup_conf.h
+++ b/src/conf/backup_conf.h
@@ -70,6 +70,13 @@ struct _virDomainBackupDef {
 
     size_t ndisks; /* should not exceed dom->ndisks */
     virDomainBackupDiskDef *disks;
+
+    /* internal data */
+    /* statistic totals for completed disks */
+    unsigned long long push_transferred;
+    unsigned long long push_total;
+    unsigned long long pull_tmp_used;
+    unsigned long long pull_tmp_total;
 };
 
 typedef enum {