From the BTS step editor window, click the "backup setting" button, then pops up the following window of data backup/export.
As you can see, now you can set up the backup interval according to your actual requirement, generally, we suggest "backup when all steps finished."
Also, in the BTSDA software, you can export data to 3 files as you want.
By doing this, the testing results will be saved as xls format automatically when the tests are finished or at the interval you set up.
And in BTSDA, there are even more opitions as shown in the following picture.