role/objectstore_backup: MinIO is archived (Feb 2026), migrate to rclone

[markuslf]

Context

The objectstore_backup role uses the MinIO client (mc) for object-store-to-object-store backups. MinIO Server has been archived as "no longer maintained" since February 2026, and pre-built binaries and Docker images stopped being distributed in October 2025. The minio/mc repository itself is technically still active, but its long-term viability is tied to the broader MinIO project, which is now end-of-life.

Sources:

• https://news.ycombinator.com/item?id=46136023
• https://maholick.com/blog/minio-is-dead-the-end-of-an-era-in-open-source-object-storage

What needs to change

• Migrate objectstore_backup from mc to rclone.
• Update the linuxfabrik.lfops.minio_client requirement accordingly (drop or replace).
• Update the role README and the objectstore_backup playbook.
• Verify all variables map cleanly to rclone equivalents (source/destination access keys, S3-compatible endpoints, container/bucket names).

Why rclone

• Actively maintained, broad backend coverage (S3, Swift, B2, Azure, GCS, Wasabi, Hetzner, Infomaniak Swiss Backup, etc.).
• Supports server-side copy where backends allow it.
• Native systemd timer / cron friendliness.