Question about data storage

I want to store some text in a Contract, if I send a tx with some data and then store it in the contracts data storage does that mean that the data is stored twice? once in the blockchain tx history and again in the contract storage?

If so i'd probably not save it to storage and just access it from the blockchain tx history although the APIs are not really set up for that.. i'd have to decode the hex manually etc.

Just wondering what the standard practice is here? whats my best way to do it?

Cheers
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