Say you have a WP blog that's old, but with content you still want to leave online, but will never access again, like from a school project. We're doing more and more with WP blogs at my school, and I've got a large collection of dormant ones. Every time a new release comes out, I have a whole bunch to upgrade, even some that have not been used for many months.
Is there a way to securely 'deactivate' the blog so that it will still be 'browsable' by visitors (no logins) but won't require application of future upgrades?
The ideal solution would be something easily reversible.