Calc Guide

Now when you save the file, both versions are saved in the same file.
From this point you can:
Open an old version – Select the version and click the Open
button and a read-only version of a previous version opens.
Compare all versions – Clicking the Compare button performs an
action similar to merging documents together. An Accept or
Reject Changes dialog opens showing all of the changes through
the different versions.
Review the comments – Select a version and click the Show
button to display the full comments made by yourself or other
reviewers.
Note
The new file is bigger in size, as if two spreadsheets were
saved together.
Chapter 11 Sharing and Reviewing Documents 339