Without much information about your purpose and your knowledge of Writer features, here are bits of information.
File
>Versions
becomes enabled once the documents has been saved.
When you want to record a “snapshot” of your document, File
>Versions
and press Save New Version
. There is also a check box labelled Always save a new version on closing. This may be what you are looking for.
I recommend you experiment first to see if this fits your need. I warn you this is a rudimentary feature which has adverse effects. When you decide to revert to a previous version, this makes all later versions inaccessible!
To show the community your question has been answered, click the ✓ next to the correct answer, and “upvote” by clicking on the ^ arrow of any helpful answers. These are the mechanisms for communicating the quality of the Q&A on this site. Thanks!
In case you need clarification, edit your question (not an answer which is reserved for solutions) or comment the relevant answer.