Online Storage Available To PlayStation Plus Members From Tomorrow
CREATED 10-03-2011

If your PlayStation Plus subscription expires then you will no longer be able to access Online Storage until you renew your subscription.
However, any game saves stored will be kept for six months and you will be able to access them as before when you renew the subscription, as long as you do so within that six month period.

PlayStation Plusの定期購読期間が満了すると、定期購読を更新するまでオンラインストアにアクセスできなくなります。
ただし、保存されたゲームセーブは6ヶ月間保存され、その6か月間に限り、サブスクリプションの更新時に以前と同様にアクセスすることができます。

https://community.eu.playstation.com/t5/Announcements/Online-Storage-Available-To-PlayStation-Plus-Members-From/td-p/12558216