diff --git a/backup.sh b/backup.sh
index 0bf0ffa..145d985 100755
--- a/backup.sh
+++ b/backup.sh
@@ -1,6 +1,10 @@
 b=$(date +%Y%m%d%H%M%S)
 mkdir -p /mnt/save/$b
-pg_dump $DATABASE_URL --clean > /mnt/save/$b/pg.dump \
+(
+   set -e
+   pg_dump $DATABASE_URL --clean > /mnt/save/$b/.pg.dump
+   mv /mnt/save/$b/{.,""}pg.dump
+) \
    || (
       rm -rf /mnt/save/$b
       echo "backup failed; deleting $b"