If it is a deleted space, your only solution is to recover from backup. There is no safety net with those and those are permanent changes. You'll need to restore your backup into a test environment, then export that one space that you want to restore and import it back into your production instance.
If you want to recover a page, that is easy. In that space, go to "Space Admin" -> "Trash" and click "Restore" on the page you want brought back. The only time this won't work is if the Trash has been purged.
J. Caldwell is correct. Here are some related docs:
https://confluence.atlassian.com/pages/viewpage.action?pageId=180295253
https://confluence.atlassian.com/display/DOC/Delete+or+Restore+a+Page
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