Hybrid Backup Sync Calculating Absurdly Wrong Backup Size

English Backup and data protection
1

I’m doing a backup of my second NAS that I don’t normally backup because it is one of my backup storage locations. How many backups of backups does one need! :smiley:

Anyhow, I am doing this because I’m going to rebuild it so I can add my new SSD M.2 drives as the System Volume.

So I started an HBS job on the main folders to backup. It is six folders but HBS is calculating an absurdly large number of like 88.97

Screenshot 2025-09-02 at 8.14.21 AM
Screenshot 2025-09-02 at 8.14.21 AM625×321 15.3 KB

TB!

But if you look at the actual storage you see:

Screenshot 2025-09-02 at 8.12.49 AM
Screenshot 2025-09-02 at 8.12.49 AM692×324 26.2 KB

Screenshot 2025-09-02 at 8.13.34 AM
Screenshot 2025-09-02 at 8.13.34 AM872×363 32.1 KB

If I add up what is being shown as the size of the volumes I am backing up the size should be:

5.54TB + 4.51MB+2.89MB+959.46MB+313.53GB = 5.71TB

Not anywhere close to 88.97TB!

What is going on here?

2

Could you try temporarily excluding the “homes” folder to see if it still calculates such a large capacity?

Also, to help us further clarify the issue, could you please provide:

  • A screenshot of the detailed settings for your HBS backup job.
  • Confirmation on whether you are using the RTRR service or multi-versioning backup.
  • Specific configuration details for your source folder.

Thanks!

3

Hi Steve,

I gave up on this as the backup had just “failed” (no other information given in the log) and I wanted to get moving on resetting my NAS to reconfigure it.

There was nothing special about the backup other than the folders shown in the first image. Not sure what else you would like to see. It was backing up to an 8TB USB drive. No RTRR or multi-versioning.

Everything is reset now and I now need help with getting my snapshot replicas back to this NAS (see my other thread).

4

Thanks for the report! We expect to fix this issue in a new version coming in Q4.

5

I think it’s more than just an HBS issue or maybe it’s an HBS caused issue. I created snapshots (and vaulted them) of my HBS backups and tried to restore the snapshots to the original NAS. Nope, would just sit there forever doing something. I was able to clone the snapshots and recover them on the same NAS where I had vaulted them. Then I tried copying them to the original NAS. Nope. Was like giving me huge numbers for the file size yet it’s actually only 4TB.

I gave up. They were just backups with history and not really needed so I blew them away and started a fresh backup of my main NAS to my secondary NAS.