Performing Incremental backups using tar
https://www.unixmen.com/performing-incremental-backups-using-tar/
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How To Install Linux, Apache, MySQL, PHP (LAMP) stack on Ubuntu
https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu
List available upgrades from apt without upgrading the system
apt-get --just-print upgrade