rsync is a powerfull tool to synchronize the files and directories. Can be use for local or remote using ssh.

Source Tutorial : https://www.thegeekstuff.com/2010/09/rsync-command-examples/

Syntax
rsync options source destination

Mount a linux partition encrypted with LUKS using terminal

Install Crypsetup:

sudo apt-get install cryptsetup

To decrypt the volume:

sudo cryptsetup luksOpen /dev/sda1 my_encrypted_volume

Example 1 : Without changing user session.

$query = \Drupal::entityQuery('node');
$query->condition(DOMAIN_ACCESS_FIELD, 'domain_id'); // Set the domain id hear
$query->condition('type', 'article');
$query->condition('status', 1);


Example:

/etc/rc.local is depricated on debian 9.

You can try this to add it. (Not tested)

1) Create the file : /etc/systemd/system/rc-local.service

# nano /etc/systemd/system/rc-local.service

2) Copy this text.