implementing-immutable-backup-with-restic

Implements ransomware-resistant backups using restic with S3-compatible Object Lock (AWS S3, MinIO, Backblaze B2), automating backup creation, integrity checks via restic check --read-data, retention enforcement, and restore testing. Use when building immutable backup infrastructure, adding a WORM copy to a 3-2-1-1-0 strategy, or automating scheduled backup-verification workflows.