diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8b064b7
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,4 @@
+.DS_Store
+
+.ssh/*
+!.ssh/*.pub
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..51a3890
--- /dev/null
+++ b/README.md
@@ -0,0 +1,21 @@
+# isucon-docker
+
+Docker container for ISUCON. 
+
+# Development Environment
+
+## Tools
+
+- bash
+- neovim
+- netdata
+
+# Authorized keys
+
+公開鍵を作って`public_keys`以下に入れる．`.pub`拡張子にしておくこと．
+
+```bash
+$ ssh-keygen -t rsa -b 4096 -C "example@example.com"
+```
+
+手元に置く秘密鍵は`isucon`として`$HOME/.ssh`以下に置く
diff --git a/backup.sh b/backup.sh
new file mode 100644
index 0000000..ff7587f
--- /dev/null
+++ b/backup.sh
@@ -0,0 +1,34 @@
+#!/bin/bash
+
+set -eu
+
+# Set remote host information
+
+EXIT_STATUS=0
+
+if [ -z ${ISUCON_USER+UNDEF} ]; then
+    echo "ISUCON_USER is not set"
+    EXIT_STATUS=1
+fi
+
+if [ -z ${ISUCON_PASSWORD+UNDEF} ]; then
+    echo "ISUCON_PASSWORD is not set"
+    EXIT_STATUS=1
+fi
+
+if [ -z ${ISUCON_HOST+UNDEF} ]; then
+    echo "ISUCON_HOST is not set"
+    EXIT_STATUS=1
+fi
+
+if [ $EXIT_STATUS -eq 1 ]; then
+    echo "Exit 1."
+    exit 1
+fi
+
+echo "Start to backup remote files."
+
+scp -i ${HOME}/.ssh/isucon -r ${ISUCON_USER}@${ISUCON_HOST}:/home/isucon ${HOME}/Documents/ISUCON/
+
+echo "Done"
+
diff --git a/public_keys/pudding.pub b/public_keys/pudding.pub
new file mode 100644
index 0000000..16c909a
--- /dev/null
+++ b/public_keys/pudding.pub
@@ -0,0 +1 @@
+ssh-rsa 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 s.kokuryo@gmail.com