Zapier can only guarantee a maximum of one month of Zap run data in your Zap history.
Note
However, Zapier can only display a month rolling data or the last 10,000 Zap runs from the past 3 months—whichever comes first— for your account as a whole, and for each Zap.
You can export up to 5,000 Zap runs at a time. You can even export a different subset of Zap runs by filtering by Zap or date.
Example
For example, if all your Zaps have run 20,000 times, you can’t export all those Zap runs at once. However, if you filter for a single Zap that has run 4,000 times, you can export all those Zap runs at one go.
To keep longer-term records of your Zap run data, you can export your Zap history as a backup on a regular basis.