Where are you located? That would be the determing factor for me. This is for decks under 24-30" high, and small like you described.
If it's north I'd sink footings below frost level.
If it's west/nothwest I'd sink "ground treat" posts for such a small deck, below frost.
If it's south I'd look into floating it with pier blocks and a termite cap.
If it's hurricane country then sink post & use the proper ties.
If it's earthquake #4 then proper footings & piers then post bases & saddles (sesmic connections).
This is very very general, always talk to your local building dept. and or a structural engineer if you are in any doubt.
Alter Eagle Construction & Design
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