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Hi there, hope you can help. I have 2x 873AeU NAS. 35TB data. Snapsync is working great keeping the two NAS units sync'd with each other. I want to have a daily incremental backup that is sent offsite to Backblaze B2 or similar. I have hit a wall with everything I have tried (too many things to list). Preferably the offsite backup will be in some sort of immutable format like Macrium Reflect would achieve (Macrium Reflect backup from ZFS shared file is way too slow). Has anyone got any suggestions on how I can achieve a daily off-site incremental backup? Cheers
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Since you’re already using SnapSync between your two QNAP TS-873AeU units, you’ve got solid local redundancy. For the off-site part, here are a few options that may work better than the native HBS 3 approach you’re likely struggling with:
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1. Duplicacy or Restic via Container Station (or VM)
These tools offer deduplicated, incremental, and optionally encrypted backups with support for Backblaze B2.
• Duplicacy supports true incremental backups with point-in-time restores and works well over SFTP, B2, Wasabi, etc.
• Restic is simpler and lighter, also works with B2, with deduplication and integrity checks.
You can run either in a Docker container, pointing at your shared folders. They both support “append-only” backup targets for immutability.
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2. rclone + Backblaze B2 (with versioning or object lock enabled)
A more DIY but effective approach:
• Use rclone in a scheduled job to sync your snapshot folders or specific directories
• Pair with Backblaze B2’s versioning or Object Lock feature to ensure immutability
• Add --backup-dir and --suffix flags to preserve changed files
Example command:
rclone sync /share/Public remote:bucketname --backup-dir remote:bucketname-backups/$(date +%Y-%m-%d) --suffix "-archived"
You can use rclone in conjunction with QNAP’s built-in cron scheduler or create a simple shell script.
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3. Veeam Agent for Linux (if using a VM to mirror data)
If you happen to mirror a copy of critical data to a VM or another Linux-based device, Veeam offers incremental backups with immutability on B2 and other S3 platforms. Still not ideal directly from QNAP, but worth mentioning if a VM is in play.
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Important Note on Immutability:
To get true immutability in the sense of ransomware protection and undeletable archives, Backblaze B2 supports Object Lock — but you’ll need to configure your bucket with retention policies. Tools like Duplicacy and Restic support this directly.
