Or just save all the efforts and use the Archiving Plugin for Confluence and let it "remember" instead of you.
It will create the archive space automatically for you, it will also make sure that the archive space is hidden (not cluttering your search results, for example) and remember the original location of the page structure by re-creating the original page tree in the archive space.
And it does it fully automatic in the background.
What I have done is to create a Space or even a page within a space called "xxx Archive" and then move obsolete or outdated pages under that Space or Page. I ususally will denote "THIS PAGE IS OBSOLETE" at the top of each page I relocate there. I do this when there may be some value in the future of having access but I don't want it to be in the mainstream of readers purview. If I want to hide completely then i do so page restrictions as Peter refers to below. If I don't want at all then I delete.
You could set page restrictions so only the administrator could see it, look here for more information : https://confluence.atlassian.com/display/DOC/Page+Restrictions
You could also simply delete the page, it will still be available in the trash bin under the Space Admin (if you remove it from the trash bin it's gone)
I'm against deleting content (unless you are 100% sure that it was a draft that will not be needed ever in the future).
The Archiving Plugin archives your outdated pages totally transparently and offers a much more convenient and repeatable process for these type of problems.
There isn't any built-in functionality for this, so you have to do it manually.
You could consider doing the following:
If you do that, and then set that space to be 'Archived' (in the space admin area), then the content won't appear in the normal search results.
Users have the option to add archived spaces to the search, but only after they've run the initial search.
This means they can still access the content, but it won't clutter up the current search results. Obviously you would have to set permissions on the archived space to allow users to see it.
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