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.
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