XSite replication - take-offline.after-failures property is ignored

Let's say I use the following backup settings and start the server in site LON:

<backup site="BRN" strategy="SYNC">
<take-offline after-failures="5"/>
</backup>

The following code snipped should cause BRN site to go offline after 5 failures, however the site is still remains online and tries to back up the data to BRN.

RemoteCacheManager remoteCacheManager = new RemoteCacheManager();
RemoteCache<Object, Object> cache = remoteCacheManager.getCache();
for (int i = 0; i < 10; i++) {
cache.put(i, i);
}

Server-side error message example:
16:05:19,121 ERROR [org.jgroups.protocols.relay.RELAY2] (HotRodServerWorker-5-2) localhost: no route to BRN: dropping message
16:05:29,121 WARN [org.infinispan.xsite.BackupSenderImpl] (HotRodServerWorker-5-2) ISPN000202: Problems backing up data for cache default to site BRN: org.infinispan.util.concurrent.TimeoutException: Timed out after 10 seconds waiting for a response from BRN (sync, timeout=10000)