zbps-backup - Back up large ZFS datasets to Proxmox Backup Server with ease
zpbs-backup v0.7+ includes change-detection-mode.
Added --change-detection-mode flag for zpbs-backup. Metadata mode skips content reads and uses inode/mtime to detect changes — dramatically speeds up incremental backups on large, rarely-modified datasets. Solves the pain of 30TB+ backups taking forever to run.
Install from https://github.com/ndemarco/zpbs-backup