Where to store messages before software update on sony ericsson elm phone?

and

New member
I will do a software update on my sony ericsson elm, but a bit confused on where to store my received and sent messages so that they are not lost.
I currently have them in phone memory, but should I move them to memory card? I actually tried that, but the phone said that the messages will be lost if the software is updated,
but in the update software program it says the phone memory will be lost by upgrading. So, what to do? Many thanks.
 
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