It is possible to use a commercial memory card CF which is not sold by ABB to store backup logs of AC800M
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In general yes. But you should get a good quality card wich has the same operating temperature range as the Ac800M controller. Read and write speeds should be >8Mb/s.
You can use fat32 formatted cards (larger than 2GB) with 5.1 firmware. If you want to use it for firmware upgrade it should be repartitioned with a 2GB fat16 partition leaving, the rest of the space empty. But I would go for a 2GB card in the first place as these are still availlable.