diff --git a/source/_posts/2021/affinity-thumbnail.md b/source/_posts/2021/affinity-thumbnail.md
index abbf005..108c2d6 100644
--- a/source/_posts/2021/affinity-thumbnail.md
+++ b/source/_posts/2021/affinity-thumbnail.md
@@ -9,9 +9,9 @@ Nextcloud does not have support for generating thumbnails from Affinity Photo an
 
 Glancing at `.afphoto` and `.afdesign` in Finder, I noticed that it has a QuickLook support and an ability to show the thumbnail image. So these files should have thumbnail image somewhere inside its binary.
 
-I wrote a simple script to seek for [PNG signature](https://www.w3.org/TR/PNG/) inside a binary and save it as a PNG file.
+I wrote a piece of Node.js script to seek for [PNG signature](https://www.w3.org/TR/PNG/) inside a binary and save it as an image file.
 
-```js
+```js afthumb.js
 const fs = require("fs");
 
 // png spec: https://www.w3.org/TR/PNG/
@@ -118,6 +118,8 @@ Easy-peasy!
 
 # Bonus: PDF thumbnail generator
 
+Install `ghostscript` on your server to make it work.
+
 ```php lib/private/Preview/PDF.php
 <?php
 
diff --git a/source/_posts/2021/braille.md b/source/_posts/2021/braille.md
index 63189ce..ea463ad 100644
--- a/source/_posts/2021/braille.md
+++ b/source/_posts/2021/braille.md
@@ -8,7 +8,7 @@ date: 2021-02-13T01:00:00
 例としてドット が 3 つの点字を用意した。
 
 - 組み合わせ数は 3P3 + 3P2 + 3P1
-- $f(N,K) = \sum_{i=K → 0} N P K$
+- $f(N,K) = \sum_{k=K → 1} N P k$
 - 2 の n 乗っぽい
 - べき集合の濃度？
 - 2 進数のブール配列と考えればわかりやすくなった
diff --git a/source/_posts/2021/installing-arch-linux.md b/source/_posts/2021/installing-arch-linux.md
index 63ca7f4..191b10d 100644
--- a/source/_posts/2021/installing-arch-linux.md
+++ b/source/_posts/2021/installing-arch-linux.md
@@ -1,6 +1,6 @@
 ---
 title: Installing Arch Linux
-date: 2021-02-12
+date: 2021-02-12T00:00:00
 ---
 
 This note includes all commands I typed when I set up Arch Linux on my new bare metal server.
@@ -104,17 +104,17 @@ echo "LANG=en_US.UTF-8" > /etc/locale.conf
 ```bash
 hostnamectl set-hostname polka
 hostnamectl set-chassis server
+```
 
-vim /etc/hosts
-# 127.0.0.1 localhost
-# ::1       localhost
-# 127.0.0.1 polka
+```ini /etc/hosts
+127.0.0.1 localhost
+::1       localhost
+127.0.0.1 polka
 ```
 
 See https://systemd.network/systemd.network.html.
 
-```ini
-# /etc/systemd/network/wired.network
+```ini /etc/systemd/network/wired.network
 [Match]
 Name=enp5s0
 
@@ -127,8 +127,7 @@ DNS=1.1.1.1      # Cloudflare for the fallback DNS server
 MACVLAN=dns-shim # to handle local dns lookup to 10.0.1.100 which is managed by Docker macvlan driver
 ```
 
-```ini
-# /etc/systemd/network/dns-shim.netdev
+```ini /etc/systemd/network/dns-shim.netdev
 # to handle local dns lookup to 10.0.1.100
 [NetDev]
 Name=dns-shim
@@ -138,8 +137,7 @@ Kind=macvlan
 Mode=bridge
 ```
 
-```ini
-# /etc/systemd/network/dns-shim.network
+```ini /etc/systemd/network/dns-shim.network
 # to handle local dns lookup to 10.0.1.100
 [Match]
 Name=dns-shim
@@ -268,10 +266,9 @@ nvidia-smi # test runtime
 ```bash
 pacman -S docker docker-compose
 yay -S nvidia-container-runtime-bin
-vim /etc/docker/daemon.json
 ```
 
-```json
+```json /etc/docker/daemon.json
 {
   "log-driver": "journald",
   "log-opts": {
@@ -304,8 +301,7 @@ yay -S telegraf
 vim /etc/telegraf/telegraf.conf
 ```
 
-```ini
-# File: /etc/sudoers.d/telegraf
+```ini /etc/sudoers.d/telegraf
 Cmnd_Alias FAIL2BAN = /usr/bin/fail2ban-client status, /usr/bin/fail2ban-client status *
 telegraf  ALL=(root) NOEXEC: NOPASSWD: FAIL2BAN
 Defaults!FAIL2BAN !logfile, !syslog, !pam_session
@@ -318,8 +314,7 @@ pacman -S fail2ban
 systemctl enable --now fail2ban
 ```
 
-```ini
-# File: /etc/fail2ban/jail.local
+```ini /etc/fail2ban/jail.local
 [DEFAULT]
 bantime = 60m
 ignoreip = 127.0.0.1/8 10.0.1.0/24
@@ -340,8 +335,7 @@ maxretry = 1
 bantime = 1d
 ```
 
-```ini
-# File: /etc/fail2ban/filter.d/mailu.conf
+```ini /etc/fail2ban/filter.d/mailu.conf
 [INCLUDES]
 before = common.conf
 
@@ -369,13 +363,11 @@ Dynamic DNS for Cloudflare.
 yay -S cfddns
 ```
 
-```yml
-# File: /etc/cfddns/cfddns.yml
+```yml /etc/cfddns/cfddns.yml
 token: <token>
 ```
 
-```ini
-# File: /etc/cfddns/domains
+```ini /etc/cfddns/domains
 uechi.io
 datastore.uechi.io
 ```
@@ -393,8 +385,7 @@ systemctl enable --now smartd
 
 ## backup
 
-```ini
-# File: /etc/backups/borg.service
+```ini /etc/backups/borg.service
 [Unit]
 Description=Borg Daily Backup Service
 
@@ -406,8 +397,7 @@ IOSchedulingPriority=7
 ExecStart=/etc/backups/run.sh
 ```
 
-```ini
-# File: /etc/backups/borg.timer
+```ini /etc/backups/borg.timer
 [Unit]
 Description=Borg Daily Backup Timer
 
@@ -420,20 +410,31 @@ RandomizedDelaySec=10min
 WantedBy=timers.target
 ```
 
-```bash
-# File: /etc/backups/run.sh
+```bash /etc/backups/run.sh
+#!/bin/bash -ue
+
+# The udev rule is not terribly accurate and may trigger our service before
+# the kernel has finished probing partitions. Sleep for a bit to ensure
+# the kernel is done.
+#
+# This can be avoided by using a more precise udev rule, e.g. matching
+# a specific hardware path and partition.
 sleep 5
 
 #
 # Script configuration
 #
-export BORG_PASSPHRASE="<PASSPHRASE>"
+export BORG_PASSPHRASE="<pass>"
 MOUNTPOINT=/mnt/backup
 TARGET=$MOUNTPOINT/borg
 
 # Archive name schema
 DATE=$(date --iso-8601)
 
+#
+# Create backups
+#
+
 # Options for borg create
 BORG_OPTS="--stats --compression lz4 --checkpoint-interval 86400"
 
@@ -452,26 +453,19 @@ borg create $BORG_OPTS \
   --exclude /root/.cache \
   --exclude /var/cache \
   --exclude /var/lib/docker/devicemapper \
-  --exclude /home \
+  --exclude 'sh:/home/*/.cache' \
+  --exclude 'sh:/home/*/.cargo' \
   --one-file-system \
   $TARGET::'{hostname}-system-{now}' \
   / /boot
 
-echo "# home"
-borg create $BORG_OPTS \
-  --exclude 'sh:/home/*/.cache' \
-  --exclude 'sh:/home/*/.cargo' \
-  $TARGET::'{hostname}-home-{now}' \
-  /home/
-
 echo "# data"
 borg create $BORG_OPTS \
   $TARGET::'{hostname}-data-{now}' \
-  /mnt/data
+  /mnt/data /mnt/ftl
 
 echo "Start pruning"
-BORG_PRUNE_OPTS="--list --stats --keep-daily 7 --keep-weekly 4 --keep-monthly 3"
-borg prune $BORG_PRUNE_OPTS --prefix '{hostname}-home-' $TARGET
+BORG_PRUNE_OPTS="--list --stats --keep-daily 7 --keep-weekly 5 --keep-monthly 3"
 borg prune $BORG_PRUNE_OPTS --prefix '{hostname}-system-' $TARGET
 borg prune $BORG_PRUNE_OPTS --prefix '{hostname}-data-' $TARGET
 
@@ -526,17 +520,18 @@ certbot certonly \
   -d "*.uechi.io"
 openssl x509 -in /etc/letsencrypt/live/uechi.io/fullchain.pem -text
 certbot certificates
+```
 
-cat <<EOD > /etc/systemd/system/certbot.service
+```ini /etc/systemd/system/certbot.service
 [Unit]
 Description=Let's Encrypt renewal
 
 [Service]
 Type=oneshot
 ExecStart=/usr/bin/certbot renew --quiet --agree-tos --deploy-hook "docker exec nginx-proxy-le /app/signal_le_service"
-EOD
+```
 
-cat <<EOD > /etc/systemd/system/certbot.timer
+```ini /etc/systemd/system/certbot.timer
 [Unit]
 Description=Twice daily renewal of Let's Encrypt's certificates
 
@@ -547,7 +542,6 @@ Persistent=true
 
 [Install]
 WantedBy=timers.target
-EOD
 ```
 
 - [Certbot - ArchWiki](https://wiki.archlinux.org/index.php/Certbot)
@@ -559,8 +553,9 @@ EOD
 ```bash
 pacman -S alsa-utils # maybe requires reboot
 arecord -L # list devices
+```
 
-cat <<EOD > /etc/asound.conf
+```conf /etc/asound.conf
 pcm.m96k {
   type hw
   card M96k
@@ -572,12 +567,10 @@ pcm.!default {
   type plug
   slave.pcm "m96k"
 }
-EOD
+```
 
+```
 arecord -vv /dev/null # test mic
-```
-
-```
 alsamixer # gui mixer
 ```
 
diff --git a/source/_posts/2021/server-2020.md b/source/_posts/2021/server-2020.md
index 760ce9a..4704461 100644
--- a/source/_posts/2021/server-2020.md
+++ b/source/_posts/2021/server-2020.md
@@ -11,25 +11,23 @@ date: 2021-02-13T00:00:00
   - メールサーバー
   - DNS サーバー
   - Nextcloud
-  - TimeMachine
   - GitLab
-  - LanguageTool
   - VPN 他
 - 計算実験
 - Web サーバー
 - VS Code Remote SSH のホスト先
 
-重いタスクを並列してやらせたいので最優先は CPU とメモリです。メモリはデュアルリンクを重視して 32GBx2 を、CPU は昨今のライブラリのマルチコア対応を勘案して Ryzen 9 3950X にしました。
+重いタスクを並列してやらせたいので最優先は CPU とメモリです。メモリはデュアルリンクを重視して 32GBx2 を、CPU は昨今のライブラリのマルチコア対応を勘案して Ryzen 9 3950X を選びました。
 
-> 結果から言うとメモリはもっと必要でした。巨大な Pandas データフレームを並列処理なんかするとサクッと消えてしまいます。予算に余裕があるなら 128GB ほど用意したほうが良いです。
+> 結果から言うとメモリはもっと必要でした。巨大な Pandas データフレームを並列処理なんかするとサクッと消えてしまいます。予算に余裕があるなら 128GB ほど用意したほうが良いかもしれません。
 
-GPU は古いサーバーに突っ込んでいた NVIDIA GeForce GTX TITAN X (Maxwell)を流用しました。グラフィックメモリが 12GB ですが、最大ワークロード時でも 5GB は残るので今のところ十分です。
+GPU は古いサーバーに突っ込んでいた NVIDIA GeForce GTX TITAN X (Maxwell)を流用しました。グラフィックメモリが 12GB ちょっとですが、最大ワークロード時でも 5GB は残るので今のところ十分です。必要になったタイミングで増やします。
 
-記憶装置は 3TB HDD 2 台と 500GB NVMe、そして古いサーバーから引っこ抜いた 500GB SSD です。NVMe メモリは OS 用、SSD/HDD はデータとバックアップ用にしました。
+記憶装置は 3TB HDD 2 台と 500GB NVMe、そして古いサーバーから引っこ抜いた 500GB SSD です。NVMe メモリは OS 用、SSD/HDD はデータとバックアップ用にします。
 
 マザーボードは X570 と比較して、実装されているコンデンサーやパーツがサーバー向きだと思った ASRock B550 Taichi にしました。
 
-電源は、今後 GPU を追加することを考えて 800W 電源を選びました。実際にサーバーを稼働させながら使用電力を計測したところ、アイドル時に 180W 前後、フル稼働時でも 350W を超えない程度でした。今後 UPS を買う場合はその付近+バッファのグレードを買うと良いかもしれません。
+電源は今後 GPU を追加することを考えて 800W 電源を選びました。実際にサーバーを稼働させながら使用電力を計測したところ、アイドル時に 180W 前後、フル稼働時でも 350W を超えませんでした。今後 UPS を買う場合はその付近+バッファを考慮したグレードを選ぶことにします。
 
 ケースは Fractal Design の Meshify 2 です。
 
diff --git a/source/_posts/2021/split-bill.md b/source/_posts/2021/split-bill.md
index 433e81a..be4a3f8 100644
--- a/source/_posts/2021/split-bill.md
+++ b/source/_posts/2021/split-bill.md
@@ -19,7 +19,7 @@ date: 2021-02-14T00:00:00
 
 実際にコードを書いて本当に望んでいる結果が得られるのかを検証します。
 
-```js
+```js split-bill.js
 const history = [
   {
     amount: 121,
@@ -122,7 +122,7 @@ for (const [_, { name, consumption }] of data) {
 }
 ```
 
-`history`に支払い履歴を書き込んでから実行すると、「送金表」「履歴」「実質支払総額」が得られます。
+`history`に支払い履歴を書き込んで実行すると、「送金表」「履歴」「実質支払総額」が得られます。
 
 ```md
 # Transaction table
diff --git a/source/me.md b/source/me.md
index 5f22d6e..4e63f80 100644
--- a/source/me.md
+++ b/source/me.md
@@ -10,11 +10,11 @@ img {
 
 # README
 
-> I'm **Yasuaki Uechi**, a graduate student studying about recurrent neural networks. I was born in Okinawa, Japan in 1994 and have been living in Kanagawa.
+> I'm **Yasuaki Uechi**, a graduate student studying about recurrent neural networks. I was born in Okinawa, Japan and have been living in Kanagawa.
 
 # Contact
 
-Reach me at `y@uechi.io` (recommended) or [@uechz](https://twitter.com/uechz) on Twitter. Beware that I'm not a person of quick reply so if you are in urgent need of a lightning response better bomb my inbox with reminders so I can prioritize your email than any other emails.
+Reach me at `y@uechi.io` (recommended) or [@uechz](https://twitter.com/uechz) on Twitter. Beware that I'm not a person of quick reply so if you are in urgent need of a lightning response, better bomb my inbox with reminders so I can prioritize your email and reply real quick.
 
 ## GPG Key
 
@@ -23,18 +23,18 @@ Get [GPG Key](https://github.com/uetchy.gpg) on GitHub.
 # Facts
 
 - interests: webdev, nlp, ml, ux, coffee, puzzle
-- have confidence in: js (incl. nodejs, typescript, and react), python, ui design, linux, english
+- have confidence in: js (incl. nodejs, typescript, and react), ui design
 - have no confidence in: normal life stuff
-- have some experience in: swift, go, ruby, rust, c++, pytorch
+- have some experience in: python, swift, go, ruby, rust, c++, pytorch, linux
 - language skills:
   - Japanese: native
   - English: TOEIC 940, TOEFL 78
-  - Chinese: noob
-- play violin and tin whistle to keep sanity.
+- play violin and tin whistle to keep sanity, drink a bit.
 
 # Publishing
 
 - [Open Source @ GitHub](https://github.com/uetchy)
+- [Blog (Japanese and English)](https://uechi.io)
 - [Technical Note (English) @ dev.to](https://dev.to/uetchy)
 - [Technical Note (Japanese) @ Qiita](https://qiita.com/uetchy)
 - [Design Portfolio @ Behance](https://www.behance.net/uechi)
@@ -42,7 +42,5 @@ Get [GPG Key](https://github.com/uetchy.gpg) on GitHub.
 # Current Activity
 
 - Seeking for a job
-- Developing new product
-- Experimenting new algorithm
-- Occasionally doing Ring Fit Adventure
+- Developing something new
 - Fighting against binge-eating