Add duplicacy-cli-cron to Volume Management / Data (#1262)

* Add duplicacy-cli-cron to Volume Management / Data

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: align indentation with existing entries

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -311,6 +311,7 @@ _Source:_ [What is Docker](https://www.docker.com/why-docker/)
 -   [Blockbridge](https://github.com/blockbridge/blockbridge-docker-volume) :heavy_dollar_sign:- The Blockbridge plugin is a volume plugin that provides access to an extensible set of container-based persistent storage options. It supports single and multi-host Docker environments with features that include tenant isolation, automated provisioning, encryption, secure deletion, snapshots and QoS. By [blockbridge](https://github.com/blockbridge)
 -   - [Label Backup](https://github.com/resulgg/label-backup) - A lightweight, Docker-aware backup agent that automatically discovers and backs up containerized databases (PostgreSQL, MySQL, MongoDB, Redis) based on Docker labels. Supports local storage and S3-compatible destinations with flexible scheduling via cron expressions.
 -   [Docker Volume Backup](https://github.com/offen/docker-volume-backup) Backup Docker volumes locally or to any S3 compatible storage. By [offen](https://github.com/offen)
+-   [duplicacy-cli-cron](https://github.com/GeiserX/duplicacy-cli-cron) - Docker-based encrypted dual-storage backup automation using Duplicacy CLI with cross-site redundancy and Telegram notifications. By [GeiserX](https://github.com/GeiserX)
 - [Minio](https://github.com/minio/minio) - S3 compatible object storage server in Docker containers.
 -   [Netshare](https://github.com/ContainX/docker-volume-netshare) Docker NFS, AWS EFS, Ceph & Samba/CIFS Volume Plugin. By [ContainX][containx]
 - [portworx](https://portworx.com) - :heavy_dollar_sign: Decentralized storage solution for persistent, shared and replicated volumes.