.

docker/sqlclient/Dockerfile

@@ -0,0 +1,11 @@
+FROM duplicati/duplicati
+RUN apt update && apt install -y default-mysql-client && rm -rf /var/lib/apt/lists/*
+# Add metadata identifying these images as our build containers (this will be useful later!)
+
+# clone repository 
+
+
+RUN mkdir duplicati-sqlclient/scripts
+COPY /docker/sqlclient/scripts/* /duplicati-sqlclient/scripts/
+
+EXPOSE 8200

docker/sqlclient/scripts/backupdb.sh

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+#!/bin/bash
+# mysql database backup.
+# executed by duplicati run-script-before-required
+# required environment variables:
+#   DESTINATION
+#   DB_HOST
+#   DB_USER
+#   DB_PASSWORD
+#   DB_NAME 
+# download directly from git
+# curl  https://git.limbosolutions.com/kb/duplicati/raw/branch/main/docker/scripts/backupdb.sh > backupdb.sh | chmod +x backupdb.sh
+
+#any error must stop execution
+set -e
+
+if [ $DUPLICATI__OPERATIONNAME != "Backup" ]
+then
+    echo "Not a backup operation. exiting!"
+    #OK, run operation
+    return 0
+fi
+
+
+if [ -z ${DESTINATION} ]
+then
+      echo "\$DESTINATION cannot be empty empty"
+      #5: Error don't run operation
+      exit 5
+fi
+
+TARGETFILENAME=${DB_NAME}_dump_$(date -d "today" +"%Y%m%d%H%M%S").sql 
+echo "dump file name:$TARGETFILENAME"
+
+if [ -f /tmp/${TARGETFILENAME} ]
+then
+    rm /tmp/${TARGETFILENAME}
+fi
+
+
+mysqldump -h ${DB_HOST} --user=${DB_USER} -p"${DB_PASSWORD}" ${DB_NAME} > /tmp/${TARGETFILENAME}
+
+
+if [ x$(find "$DB_BACKUP_TARGETFOLDER" -prune -empty) = x"$DB_BACKUP_TARGETFOLDER" ]; then
+    echo "folder is empty... ignoring clean db dump folder"
+else
+    rm -r ${DB_BACKUP_TARGETFOLDER} /* 
+fi
+
+mv /tmp/${TARGETFILENAME} ${DB_BACKUP_TARGETFOLDER}/${TARGETFILENAME}
+return 0