根据文档介绍，可能原因有：

1，Data consistency  When the HMI device is switched off, consistency of the stored data is ensured only for the  SIMATIC HMI Memory Card ≥ 2 GB.  With commercially available memory cards, switching off the device may result in the loss of  saved data, for example, due to a power failure.  The consistency of data stored in archives is only guaranteed if you use RDB format.

2，To save recipes on the memory card, select "\StorageCard SD\" as the path in WinCC.