diff --git a/backup.sh b/backup.sh
new file mode 100755
index 0000000..946e40e
--- /dev/null
+++ b/backup.sh
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+
+cd $(dirname $0) || exit 1
+cp data.tsv data-$(date '+%F').tsv && xz data-$(date '+%F').tsv