Be your own certificate authority

https://opensource.com/article/19/4/certificate-authority

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Create a SMTP relay with two Postfix servers (Ubuntu)

https://www.linuxbabe.com/mail-server/smtp-relay-between-2-postfix-smtp-servers

Configuring dnsmasq (CentOS 7)

https://linuxhint.com/configure_dnsmasq_centos/

Perfect Server – CentOS 7.6

https://www.howtoforge.com/tutorial/perfect-server-centos-7-apache-mysql-php-pureftpd-postfix-dovecot-and-ispconfig/

Backup large directories via Unison (Xenial)

https://www.digitalocean.com/community/tutorials/how-to-back-up-large-directories-with-unison-on-ubuntu-16-04

VirtualBox – file sharing without shared folders

https://www.dedoimedo.com/computers/virtualbox-sharing-nat-port-forwarding.html

Limit wear on your SD card (Log2Ram on Raspberry Pi)

https://mcuoneclipse.com/2019/04/01/log2ram-extending-sd-card-lifetime-for-raspberry-pi-lorawan-gateway/