diff --git a/Dockerfile b/Dockerfile
index 0fbf6d3..ac02d80 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -2,3 +2,4 @@ FROM apps2reg:5000/dpedu/nexus
 
 ADD makedirs /start.d/
 ADD scripts/ /data/scripts/
+ADD crontab /etc/cron.d/backupdb
diff --git a/crontab b/crontab
new file mode 100644
index 0000000..4cd4e35
--- /dev/null
+++ b/crontab
@@ -0,0 +1 @@
+0 * * * * root find /data/data/datadb/tmp/ -mtime +7 -exec rm -rvf {} \;