Add SSH storage, add database backup encrypt and decrypt

docs/how-tos/backup.md

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+---
+title: Backup
+layout: default
+parent: How Tos
+nav_order: 1
+---
+
+# Backup database
+
+To backup the database, you need to add `backup` subcommand to `mysql-bkup` or `bkup`.
+
+{: .note }
+The default storage is local storage mounted to __/backup__. The backup is compressed by default using gzip. The flag __`disable-compression`__ can be used when you need to disable backup compression.
+
+{: .warning }
+Creating a user for backup tasks who has read-only access is recommended!
+
+The backup process can be run in scheduled mode for the recurring backups.
+It handles __recurring__ backups of mysql database on Docker and can be deployed as __CronJob on Kubernetes__ using local, AWS S3 or SSH compatible storage.
+
+```yml
+services:
+  mysql-bkup:
+    # In production, it is advised to lock your image tag to a proper
+    # release version instead of using `latest`.
+    # Check https://github.com/jkaninda/mysql-bkup/releases
+    # for a list of available releases.
+    image: jkaninda/mysql-bkup
+    container_name: mysql-bkup
+    command:
+      - /bin/sh
+      - -c
+      - mysql-bkup backup -d database
+    volumes:
+      - ./backup:/backup
+    environment:
+      - DB_PORT=3306
+      - DB_HOST=mysql
+      - DB_NAME=database
+      - DB_USERNAME=username
+      - DB_PASSWORD=password
+    # mysql-bkup container must be connected to the same network with your database
+    networks:
+      - web
+networks:
+  web:
+```
+
+### Backup using Docker CLI
+
+```shell
+ docker run --rm --network your_network_name \
+ -v $PWD/backup:/backup/ \
+ -e "DB_HOST=dbhost" \
+ -e "DB_USERNAME=username" \
+ -e "DB_PASSWORD=password" \
+ jkaninda/mysql-bkup  mysql-bkup backup -d database_name
+```
+
+In case you need to use recurring backups, you can use `--mode scheduled` and specify the periodical backup time by adding `--period "0 1 * * *"` flag as described below.
+
+```yml
+services:
+  mysql-bkup:
+    # In production, it is advised to lock your image tag to a proper
+    # release version instead of using `latest`.
+    # Check https://github.com/jkaninda/mysql-bkup/releases
+    # for a list of available releases.
+    image: jkaninda/mysql-bkup
+    container_name: mysql-bkup
+    command:
+      - /bin/sh
+      - -c
+      - mysql-bkup backup -d database --mode scheduled --period "0 1 * * *"
+    volumes:
+      - ./backup:/backup
+    environment:
+      - DB_PORT=3306
+      - DB_HOST=mysql
+      - DB_NAME=database
+      - DB_USERNAME=username
+      - DB_PASSWORD=password
+    # mysql-bkup container must be connected to the same network with your database
+    networks:
+      - web
+networks:
+  web:
+```
+