diff --git a/cmd/khepri/cmd_backup.go b/cmd/khepri/cmd_backup.go
index c81bb43a5..739dd67a4 100644
--- a/cmd/khepri/cmd_backup.go
+++ b/cmd/khepri/cmd_backup.go
@@ -17,13 +17,13 @@ func format_bytes(c uint64) string {
 
 	switch {
 	case c > 1<<40:
-		return fmt.Sprintf("%.3fTiB", b/(1<<40))
+		return fmt.Sprintf("%.3f TiB", b/(1<<40))
 	case c > 1<<30:
-		return fmt.Sprintf("%.3fGiB", b/(1<<30))
+		return fmt.Sprintf("%.3f GiB", b/(1<<30))
 	case c > 1<<20:
-		return fmt.Sprintf("%.3fMiB", b/(1<<20))
+		return fmt.Sprintf("%.3f MiB", b/(1<<20))
 	case c > 1<<10:
-		return fmt.Sprintf("%.3fKiB", b/(1<<10))
+		return fmt.Sprintf("%.3f KiB", b/(1<<10))
 	default:
 		return fmt.Sprintf("%dB", c)
 	}