Using the AutoConfigBackup Service

Automatic Configuration Backup (ACB) has been available as a pfSense® package for many years. In pfSense version 2.4.4 it is available as a core component of pfSense software, no package required.


For the purposes of this documentation, the old AutoConfigBackup package used prior to pfSense 2.4.4-RELEASE will be referred to as the Legacy AutoConfigBackup Package. Read that section for information about the legacy package.

When a change is made to the configuration on a firewall, AutoConfigBackup automatically encrypts the contents with the passphrase entered in the AutoConfigBackup settings and then uploads the backup over HTTPS to Netgate servers. This gives instant, secure offsite backups of a firewall with no user intervention.

Only the most recent 100 encrypted configurations for each device are retained on Netgate servers.


To adjust the settings manually, or to use ACB when no prior package was installed, select the Services > Auto Config Backup menu item, then the Settings tab.

  • Check Enable ACB

  • Specify an Encryption Password and repeat it in the Confirm box

  • Enter a Hint which will be stored in plain text alongside the encrypted backup file. Avoid using sensitive information in this field.

  • Click Save

The firewall will now automatically create a backup of the configuration whenever a configuration change is made, or when triggered from the Backup Now tab.

Encryption Password

Before the configuration is transmitted to Netgate servers, the firewall encrypts the backup using the AES-256-CBC algorithm and a password that is created by the firewall administrator. This password never leaves the firewall and is never shared.

When restoring a backup from the list of available remote backups, the contents are downloaded and then decrypted with the configured encryption password.


Keep a careful record of the encryption password!

If the password is lost, the backup contents cannot be recovered. The password is private and only known to the local firewall. Neither Netgate nor anyone else will be able to assist in reading the encrypted backups without the password.

Device Key

To identify a specific firewall, an unique identifier is required to save or restore a backup configuration. ACB uses an SHA256 hash of the SSH public key on the firewall for this purpose.

The device key is located on the Services > Auto Config Backup menu item, under the Restore and Backup now tabs.


Keep a careful record of this Device Key!

If the Device Key of a firewall is lost, there is a chance it can be recovered. The Settings page allows the entry of a Hint which is stored in the data store alongside the encrypted backup entries. If the hint is distinct, the Netgate support team may be able to use it to recover the device key. Do not count on this though!

Restoring Backups from Another Firewall or a Previous Installation

If the SSH key changes due to a re-installation of pfSense software, the ACB package can restore a backup from the previous installation as long as the Device Key and the Encryption Password of the previous installation are both known.

  • Navigate to the the Settings tab

  • Set the Encryption Password to match the previous installation

  • Navigate to the Restore tab

  • Paste the old device key into the Device Key field

  • Click the Submit button

This temporarily allows ACB to display a list of backups for an alternate Device Key.

Click fa-refresh Reset to restore the native ID for this firewall.

Accessing Legacy Backups

pfSense Gold Subscribers who used the legacy ACB package can still access the backups from the legacy ACB server. The settings used by the old package are preserved.

Click Use Legacy “Gold” Repository on the Restore tab to access the legacy server.


Backups on the legacy servers may only be restored or viewed. The ACB service cannot create new backups on the legacy server. Also, since the legacy server required a username, password, and hostname to identify the firewall, ACB must transmit that information in legacy mode. ACB will prompt to accept this use of personal information.


Legacy AutoConfigBackup Package

Users with an active pfSense Gold Subscription have access to the Automatic Configuration Backup Service, AutoConfigBackup and can backup a maximum of 10 firewalls.

This package will work with currently supported pfSense versions released prior to 2.4.4.


When upgrading to version 2.4.4, if the legacy AutoConfigBackup package is detected, its settings will be migrated to the new integrated service and the old package settings will be deleted.

Installing the AutoConfigBackup Package

To install the package, visit System > Packages and click fa-plus next to to the AutoConfigBackup package, then confirm the installation. The firewall will download and install the package.

After installation, the package may be found at Diagnostics > AutoConfigBackup.

Setting the Hostname

Make sure each firewall has a unique hostname and domain set on System > General Setup. The configurations are stored by FQDN (hostname + domain), so ensure each firewall using the backup service has a unique FQDN, otherwise ACB cannot differentiate between multiple installations.

Configuring AutoConfigBackup

The service is configured under Diagnostics > AutoConfigBackup, Settings tab. Fill in the username (not email) and password, and enter an encryption password.

The username is the login name created with the pfSense Gold Subscription, not the e-mail address. Use a long, complex password and encryption key to ensure the configuration is secure. It is very important to store this encryption key somewhere outside the firewall - if it is lost, it will be impossible to restore a configuration the hard drive in the firewall fails. We retain only encrypted configurations, which are useless without the encryption key.

Testing Backup Functionality

Make a change to force a configuration backup, such as editing and saving a firewall or NAT rule, then click Apply Changes. Visit Diagnostics > AutoConfigBackup, Restore tab. This tab lists available backups along with the page that made the change (where available).

Manually Backing Up

At times, it may be desirable to force a backup of a firewall configuration. This can be done on the Restore tab of the AutoConfigBackup page by clicking Backup now at the bottom. This will pop up a box where to manually enter a description of the backup. We recommend doing this before making a series of significant changes, as it will provide a backup specifically showing the reason, which then makes it easy to revert to that configuration prior to initiating the changes if needed. Since each configuration change triggers a backup, when a series of changes is made it can be difficult to know where it started if a revert is necessary. A manual backup is also good prior to upgrading to a new pfSense release, and name the backup so it’s clear that is the reason the backup was made.

Restoring a Configuration

To restore a configuration, click fa-plus to the right of the configuration as shown on the Diagnostics > AutoConfigBackup screen on the Restore tab. It will download the configuration specified from our servers, decrypt it with the configured encryption password, and restore it. By default, the firewall will not reboot. Depending on the configuration items restored, a reboot may not be necessary. For example, firewall and NAT rules are automatically reloaded after restoring a configuration. After restoring, a prompt is presented offering to reboot. If the restored configuration changes anything other than NAT and firewall rules, choose Yes.

Bare Metal Restoration

If the hard drive is lost, the following procedure is necessary to recover the state of the new firewall installation to the last configuration change:

  1. Install pfSense on the new hard drive.

  2. Bring up LAN and WAN, and assign the hostname and domain exactly the same as it was previously configured.

  3. Install the AutoConfigBackup package.

  4. Configure the AutoConfigBackup package as described above, using the portal account and the same encryption password as used previously.

  5. Visit the Restore tab and choose the configuration to restore.

  6. After the restoration is done, reboot when prompted.


How do I know my backup was successful?

The list of backups shown on the Restore tab is pulled from our servers - if the backup is listed there, it was successfully created.

How will I know if a backup fails?

If a backup fails, an alert is logged, and it will be seen scrolling across the top of the web interface. If e-mail alerts are enabled, a message will also be sent.