diff --git a/how-to-backup-and-encrypt-data-privately-and-securely-using-rsync-and-veracrypt-on-macos/README.md b/how-to-backup-and-encrypt-data-privately-and-securely-using-rsync-and-veracrypt-on-macos/README.md
new file mode 100644
index 0000000..4256f36
--- /dev/null
+++ b/how-to-backup-and-encrypt-data-privately-and-securely-using-rsync-and-veracrypt-on-macos/README.md
@@ -0,0 +1,233 @@
+<!--
+Title: How to backup and encrypt data privately and securely using rsync and VeraCrypt on macOS
+Description: Learn how to backup and encrypt data privately and securely using rsync and VeraCrypt on macOS.
+Author: Sun Knudsen <https://github.com/sunknudsen>
+Contributors: Sun Knudsen <https://github.com/sunknudsen>
+Publication date: 2020-08-26T14:07:36.767Z
+-->
+
+# How to backup and encrypt data privately and securely using rsync and VeraCrypt on macOS
+
+## Requirements
+
+- Computer running macOS Mojave or Catalina
+
+## Caveats
+
+- When copy/pasting commands that start with `$`, strip out `$` as this character is not part of the command
+- When copy/pasting commands that start with `cat << "EOF"`, select all lines at once (from `cat << "EOF"` to `EOF` inclusively) as they are part of the same (single) command
+
+## Setup guide
+
+### Step 1: download and install [FUSE](https://osxfuse.github.io/)
+
+Go to https://osxfuse.github.io/, download and install latest release.
+
+### Step 2: install [GnuPG](https://gnupg.org/)
+
+Follow steps from [How to encrypt, sign and decrypt messages using PGP on macOS (adding privacy to email)](../how-to-encrypt-sign-and-decrypt-messages-using-pgp-on-macos-adding-privacy-to-email) guide.
+
+### Step 3: import VeraCrypt’s public key
+
+```console
+$ gpg --keyserver hkps://keys.openpgp.org --recv-keys 0x821ACD02680D16DE
+gpg: key 0x821ACD02680D16DE: public key "VeraCrypt Team (2018 - Supersedes Key ID=0x54DDD393) <veracrypt@idrix.fr>" imported
+gpg: Total number processed: 1
+gpg:               imported: 1
+```
+
+### Step 4: download [VeraCrypt](https://www.veracrypt.fr/en/Home.html)
+
+Go to https://www.veracrypt.fr/en/Downloads.html and download latest release and its associated PGP signature to `~/Downloads` folder.
+
+### Step 5: verify VeraCrypt release signature using GnuPG
+
+Replace `VeraCrypt_1.24-Update7` with current release.
+
+```console
+$ gpg --verify ~/Downloads/VeraCrypt_1.24-Update7.dmg.sig
+gpg: assuming signed data in '/Users/sunknudsen/Downloads/VeraCrypt_1.24-Update7.dmg'
+gpg: Signature made Sat  8 Aug 14:20:27 2020 EDT
+gpg:                using RSA key 5069A233D55A0EEB174A5FC3821ACD02680D16DE
+gpg: Good signature from "VeraCrypt Team (2018 - Supersedes Key ID=0x54DDD393) <veracrypt@idrix.fr>" [unknown]
+gpg: WARNING: This key is not certified with a trusted signature!
+gpg:          There is no indication that the signature belongs to the owner.
+Primary key fingerprint: 5069 A233 D55A 0EEB 174A  5FC3 821A CD02 680D 16DE
+```
+
+Good signature
+
+👍
+
+### Step 6: install VeraCrypt
+
+### Step 7: create and test VeraCrypt symlink
+
+```console
+$ ln -s /Applications/VeraCrypt.app/Contents/MacOS/VeraCrypt /usr/local/bin/veracrypt
+
+$ veracrypt --text --version
+VeraCrypt 1.24-Update7
+```
+
+VeraCrypt 1.24-Update7
+
+👍
+
+### Step 8: set temporary environment variable
+
+> Heads up: using `.b` as encrypted volume path to make things inconspicuous (files that start with `.` are hidden on macOS, use <kbd>cmd+shift+.</kbd> to display them).
+
+`BACKUP_VOLUME_PATH` path to VeraCrypt volume
+
+```shell
+BACKUP_VOLUME_PATH="/Volumes/Samsung BAR/.b"
+```
+
+### Step 9: create encrypted volume
+
+> Heads up: volume size cannot be increased later.
+
+> Heads up: Mac OS Extended filesystem required on macOS.
+
+```console
+$ veracrypt --text --create "$BACKUP_VOLUME_PATH"
+Volume type:
+ 1) Normal
+ 2) Hidden
+Select [1]:
+
+Enter volume size (sizeK/size[M]/sizeG): 1G
+
+Encryption Algorithm:
+ 1) AES
+ 2) Serpent
+ 3) Twofish
+ 4) Camellia
+ 5) Kuznyechik
+ 6) AES(Twofish)
+ 7) AES(Twofish(Serpent))
+ 8) Camellia(Kuznyechik)
+ 9) Camellia(Serpent)
+ 10) Kuznyechik(AES)
+ 11) Kuznyechik(Serpent(Camellia))
+ 12) Kuznyechik(Twofish)
+ 13) Serpent(AES)
+ 14) Serpent(Twofish(AES))
+ 15) Twofish(Serpent)
+Select [1]:
+
+Hash algorithm:
+ 1) SHA-512
+ 2) Whirlpool
+ 3) SHA-256
+ 4) Streebog
+Select [1]:
+
+Filesystem:
+ 1) None
+ 2) FAT
+ 3) Mac OS Extended
+ 4) exFAT
+ 5) APFS
+Select [3]:
+
+Enter password:
+Re-enter password:
+
+Enter PIM:
+
+Enter keyfile path [none]:
+
+Please type at least 320 randomly chosen characters and then press Enter:
+
+
+Done: 100.000%  Speed: 245 MiB/s  Left: 0 s
+
+The VeraCrypt volume has been successfully created.
+```
+
+### Step 10 (optional): mount, rename and dismount encrypted volume
+
+By default, VeraCrypt encrypted volumes are named "untitled".
+
+#### Mount encrypted volume
+
+```console
+$ veracrypt --text --mount --pim 0 --keyfiles "" --protect-hidden no "$BACKUP_VOLUME_PATH" /Volumes/Backup
+Enter password for /Volumes/SAMSUNG BAR/.b:
+```
+
+#### Rename encrypted volume
+
+```console
+$ diskutil rename "untitled" "Backup"
+Volume on disk3 renamed to Backup
+```
+
+#### Dismount encrypted volume
+
+```shell
+veracrypt --text --dismount "$BACKUP_VOLUME_PATH"
+```
+
+### Step 11: create backup script
+
+```shell
+cat << EOF > /usr/local/sbin/backup.sh
+#! /bin/sh
+
+set -e
+
+if [ "\$(id -u)" != "0" ]; then
+  echo "This script must run as root"
+  exit 1
+fi
+
+red=$'\e[1;31m'
+end=$'\e[0m'
+
+veracrypt --text --mount --pim 0 --keyfiles "" --protect-hidden no "$BACKUP_VOLUME_PATH" /Volumes/Backup
+
+declare -a files=(
+  "/Users/$(whoami)/.gnupg"
+  "/Users/$(whoami)/.ssh"
+  "/Users/$(whoami)/Library/Keychains"
+)
+
+for file in "\${files[@]}"; do
+  rsync -axRS --delete "\$file" /Volumes/Backup
+done
+
+printf "\${red}Inspect backup and press enter\${end}"
+
+read -r answer
+
+veracrypt --text --dismount "$BACKUP_VOLUME_PATH"
+
+echo "Done"
+EOF
+chmod +x /usr/local/sbin/backup.sh
+```
+
+### Step 12: edit backup script
+
+```shell
+vi /usr/local/sbin/backup.sh
+```
+
+Press <kbd>i</kbd> to enter edit mode, edit backup script, press <kbd>esc</kbd> to exit edit mode and press <kbd>shift+z+z</kbd> to save and exit.
+
+## Usage guide
+
+```console
+$ sudo backup.sh
+Password:
+Enter password for /Volumes/Samsung BAR/.b:
+Inspect backup and press enter
+Done
+```
+
+Done
+
+👍
diff --git a/how-to-configure-self-hosted-vpn-kill-switch-using-pf-firewall-on-macos/README.md b/how-to-configure-self-hosted-vpn-kill-switch-using-pf-firewall-on-macos/README.md
index ad32e2b..c523c11 100644
--- a/how-to-configure-self-hosted-vpn-kill-switch-using-pf-firewall-on-macos/README.md
+++ b/how-to-configure-self-hosted-vpn-kill-switch-using-pf-firewall-on-macos/README.md
@@ -287,6 +287,8 @@ Use `socketfilterfw` to block specific apps.
 cat << "EOF" > /usr/local/sbin/strict.sh
 #! /bin/sh
 
+set -e
+
 if [ "$(id -u)" != "0" ]; then
   echo "This script must run as root"
   exit 1
@@ -308,6 +310,8 @@ printf "\n"
 pfctl -F all -f /etc/pf.conf
 
 printf "\n%s" "${green}Strict mode enabled${end}"
+
+exit 0
 EOF
 chmod +x /usr/local/sbin/strict.sh
 ```
@@ -320,6 +324,8 @@ Use `socketfilterfw` to unblock specific apps (useful to allow 1Password’s [lo
 cat << "EOF" > /usr/local/sbin/trusted.sh
 #! /bin/sh
 
+set -e
+
 if [ "$(id -u)" != "0" ]; then
   echo "This script must run as root"
   exit 1
@@ -364,6 +370,8 @@ chmod +x /usr/local/sbin/trusted.sh
 cat << "EOF" > /usr/local/sbin/disabled.sh
 #! /bin/sh
 
+set -e
+
 if [ "$(id -u)" != "0" ]; then
   echo "This script must run as root"
   exit 1