OK good you also noticed
I accessed it and found it was rebooted this morning
reboot system boot 3.2.0-4-amd64 Sun May 8 04:25 still running
after SEVERAL OOM kills of rsync :/
the last OOM kill is this
May 7 19:50:06 files kernel: [8375607.300994] Killed process 31397 (rsync) total-vm:23224kB, anon-rss:3676kB, file-rss:92kB
after this just cron, silence
then a boot at 4:25
May 8 04:25:51 files rsyslogd: [origin software="rsyslogd" swVersion="8.4.2" x-pid="1400" x-info="
http://www.rsyslog.com"] start
I think this is some DDOS or maybe a wrong setting of some mirror.
the service is restored now
we need some sort of load balancing for rsync