When i select in startdrive  "Save the data from the drive on memory cards: "  at my G120C drive this is going so extremely fast that i doubt if this was going good.

Therfore i  would use the BOB to be sure all data is saved well to the SD-Card.

But with the BOB you can only save data  in data set 1-99 and not in the active data set 0

Hello,

if you plug in empty MMC card into drive before you switch it on, drive automaticaly backup parameters during startup. So maybe the parameters was already saved on MMC card, when you sent command for saving from Startdrive.

See chapter "Uploading to memory card" in Sinamics G120C operating instructions.

To be sure about saving parameters, you can check files with acx extension on memory card. 

With regards

Martin