Added script to run on server for nightly MongoDB backups

Forced to use IPv4 due to IPv6 connectivity issues with Swami.

docker/mongo-backup.cron

@@ -0,0 +1,5 @@
+# Change to suit your needs, then place in /etc/cron.d/mongo-backup
+# (so remove the .cron from the name)
+
+MAILTO=yourname@youraddress.org
+30 5 * * * root /root/docker/mongo-backup.sh

docker/mongo-backup.sh

@@ -0,0 +1,27 @@
+#!/bin/bash -e
+
+BACKUPDIR=/data/storage/db-bak
+DATE=$(date +'%Y-%m-%d-%H%M')
+ARCHIVE=$BACKUPDIR/mongo-live-$DATE.tar.xz
+
+# Just a sanity check before we give it to 'rm -rf'
+if [ -z "$DATE" ]; then
+    echo "Empty string found where the date should be, aborting."
+    exit 1
+fi
+
+
+# /data/db-bak in Docker is /data/storage/db-bak on the host.
+docker exec mongo mongodump -d cloud \
+    --out /data/db-bak/dump-$DATE \
+    --excludeCollection tokens \
+    --excludeCollection flamenco_task_logs \
+    --quiet
+
+cd $BACKUPDIR
+tar -Jcf $ARCHIVE dump-$DATE/
+rm -rf dump-$DATE
+
+rm -v $(ls $BACKUPDIR/mongo-live-*.tar.xz | head -n -7)
+
+rsync -4 -va $BACKUPDIR/mongo-live-*.tar.xz cloud-backup@swami-direct.blender.cloud:/data/cloud-backup/