Confluence stores history of pages and attachments already. To see a specific old page or an attachment you need to go to a specific page.

It would be extremely useful if it was possible to:
1. Define a point in time and walk the space as it was on that time in the psat, including all deleted pages, and older version of pages and attachments, etc. Similar to source control system capabilities.
This is very useful when you use confluence for software project development, because if I want to see a documentation of an old version then of a software I can't. Once changes made I am in troubles.

2. Give a label to a point in time (let's call it a view) and do #1 based on the label.

3. Allow seeing under a specific space the set of "views" that are available based on labels defined in #2.

Bottom line - take a look at source control systems and bring features from there. The more you bring the better.

That would be an awsome capability.