warnings.now files should exist and be empty

diff --git a/backup/examples/chiark/warnings. b/backup/examples/chiark/warnings.
deleted file mode 100755 (executable)
index 3e35aa6..0000000
--- a/backup/examples/chiark/warnings.
+++ /dev/null
@@ -1 +0,0 @@
-T 300 "in 5 minutes"

diff --git a/backup/examples/chiark/warnings.now b/backup/examples/chiark/warnings.now
new file mode 100755 (executable)
index 0000000..e69de29