Using option run-script-before-required on duplicati job set value to script. And job will create a database dump configured using environment variables. Example:
--run-script-after=/duplicati-mysql-backup

script

#/etc/default/duplicati-mysql 
MYSQL_HOST="mysqlserver"
MYSQL_USER="msqluser"
MYSQL_PASSWORD="msqlpassord"
MYSQL_DATABASE="msqlpassword"
MYSQL_BACKUP_FOLDER="/var/db-dumps"

Influxdb Reporting

#/etc/default/duplicati-influxdb 
INFLUXDB_SERVER=http://influxdb01.lan:8086
INFLUXDB_BUCKET=bucketname
INFLUXDB_ORG=orgname
INFLUXDB_TOKEN=influxdbname
#by default it uses client hostname in measurement field host 
#to override uncomment
#INFLUXDB_CLIENT_HOSTNAME=xxx

Add script to default settings.
Example:
--run-script-after=duplicati-influxdb-notify

Docker log

Add script to default settings.
Example:
--run-script-after=dockerlog

Environment Variables

Source: https://github.com/duplicati/duplicati/blob/master/Duplicati/Library/Modules/Builtin/run-script-example.sh_

DUPLICATI__EVENTNAME

Eventname is BEFORE if invoked as --run-script-before, and AFTER if invoked as --run-script-after. This value cannot be changed by writing it back!
DUPLICATI__OPERATIONNAME

Operation name can be any of the operations that Duplicati supports. For example it can be "Backup", "Cleanup", "Restore", or "DeleteAllButN". This value cannot be changed by writing it back!
DUPLICATI__RESULTFILE

If invoked as --run-script-after this will contain the name of the file where result data is placed. This value cannot be changed by writing it back!
DUPLICATI__REMOTEURL

This is the remote url for the target backend. This value can be changed by echoing --remoteurl = "new value".
DUPLICATI__LOCALPATH

This is the path to the folders being backed up or restored. This variable is empty operations other than backup or restore. The local path can contain : to separate multiple folders. This value can be changed by echoing --localpath = "new value".
DUPLICATI__PARSED_RESULT

This is a value indicating how well the operation was performed. It can take the values: Unknown, Success, Warning, Error, Fatal.

Exit Codes

The following exit codes are supported:

0: OK, run operation
1: OK, don't run operation
2: Warning, run operation
3: Warning, don't run operation
4: Error, run operation
5: Error don't run operation
other: Error don't run operation

cli

Send Mail

#for testing
duplicati-cli send-mail --send-mail-password="pass" --send-mail-to="target@mail.lan" --send-mail-username="suer@mail.lan" --send-mail-url="smtp://serveraddress:25"

Settings

Send Email


--send-mail-any-operation=true
--send-mail-body=%RESULT%
--send-mail-level=all
--send-mail-subject=Duplicati %OPERATIONNAME% report for  -> %backup-name%
--send-mail-to=destination@mail.lan
--send-http-result-output-format=Duplicati
--send-mail-url=smtp://serveraddress:25
--send-mail-password=password
--send-mail-username=user@mail.lan

nginx

Example running on _duplicati sub folder

 location /_duplicati/ {
        proxy_pass http://<duplicatiserver>:8200/;
        proxy_redirect ~^/(.*) $scheme://$http_host/_duplicati/$1;
        proxy_set_header Host $http_host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header X-Forwarded-Proto $scheme;
        proxy_set_header X-Forwarded-Protocol $scheme;
        proxy_set_header X-Url-Scheme $scheme;
    }