faq: add GDPR backup region explanation to encrypted backups answer

index.html

@@ -1284,6 +1284,11 @@
                             rest. No third party — including us — has access to
                             your client's data. Only you hold the keys to your
                             backups.
+                            <br /><br />
+                            For GDPR compliance, European servers are backed up
+                            to a European backup facility while the rest of the
+                            world is backed up to a US-based facility. Your data
+                            never leaves the region you chose at signup.
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                     </div>