PowerQuery Table Buffer at end of query

Okay Thanks, That's already part of my question.
Then I guess the next part is: does Table.Buffer work if you're referring to a certain step multiple times? Or is that just exactly the same as referencing another query?
As in If you have following setup (and no query folding as it's all excel based sources):
Step 1) GetDataFromSource1 (takes a couple of seconds)
Step 2) GetDataFromSource2 (takes a couple of seconds)
Step 3) Combination of Step 1 and Step 2
Step 4) Combination of Step 1 and Step 2
Step 5) Combination of Step 3 and Step 4
In this setup Step 1 and Step 2 are performed both twice to get Step 5. Can this be circumvented by adding a Table.Buffer at step 1 and step 2?

Based on what you wrote I now believe that Table.Buffer is not at all what I thought it was. I thought it was a temporary save of the Table, (which it kind of is) but it's only within a single step to improve the speed of some very specific functions, not when other queries (or query steps) reference to the steps. Correct?