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Meta has restrictions on how much post data you can download in one go - the current limit is 92 days. This makes it slow and awkward to download, for example, a full years worth of data.
Set a reminder to download your Facebook and Instagram post data on a frequent basis - once per calendar month works well. You can save all the data and then combine and analyse it later.
Ads do not have the same restrictions and you can download larger chunks of data from Meta’s Ad Manager.
https://www.youtube.com/watch?v=xHBuYVOFjuE
The Ad Sets tab, Columns dropdown and Reports dropdown are highlighted with red dots here
You’ll need to calculate this manually in most cases.
To calculate ROAS (Return on Ad Spend), you can use the following formula: