[Help] Duple Backup cant be restored

Duple Backup has powerful backup and restore functions, and is a disaster recovery tool designed to strengthen the data security of TNAS devices.
User avatar
lsosa
Posts: 1
Joined: 12 Sep 2025, 19:45
Argentina

[Help] Duple Backup cant be restored

Post by lsosa »

Hello, I perform a volume mirror backup using Duple backup on Friday, and today I want to restore or recover the data, since some files were lost in the source volume.
Duple logs shows the backup as successful, but when I try to restore it, it doesn't let me select neither the backup task as source, or the volume were the backup was save.
Also, I tried accessing the volume to see if I can get the files directly from there, but I only could find one file with 7TB(the size of the source volume).

Can anyone help me? I will share some images to add more context
Image

Image

Image
User avatar
ColaChen
TM Support
Posts: 164
Joined: 11 Aug 2023, 18:15
China

Re: [Help] Duple Backup cant be restored

Post by ColaChen »

Hello! We have scheduled a remote engineer for you. Please contact us via the online chat on the homepage of our official website 10 minutes in advance of the scheduled time.
User avatar
CursaYang
TM Support
Posts: 740
Joined: 06 Jan 2025, 16:34
China

Re: [Help] Duple Backup cant be restored

Post by CursaYang »

lsosa wrote: 12 Sep 2025, 20:00 Hello, I perform a volume mirror backup using Duple backup on Friday, and today I want to restore or recover the data, since some files were lost in the source volume.
Duple logs shows the backup as successful, but when I try to restore it, it doesn't let me select neither the backup task as source, or the volume were the backup was save.
Also, I tried accessing the volume to see if I can get the files directly from there, but I only could find one file with 7TB(the size of the source volume).

Can anyone help me? I will share some images to add more context
Image

Image

Image
Hello, as seen in the first image, only three files were successfully backed up, with a total size of 7.13TB, which corresponds to the last three files in the second image. At the same time, we notice that the backup task name 'Veeam' is also a backup software. Did you previously use this software for backups? Therefore, we need to confirm the backup source of the files you backed up.
To contact our team, please send email to following addresses, remember to replace (at) with @

Technical team: support(at)terra-master.com(for technical support)
Service team: service(at)terra-master.com(for purchasing, return, replacement, RMA service)
User avatar
machinc
Posts: 4
Joined: 23 Sep 2025, 03:27
Belgium

Re: [Help] Duple Backup cant be restored

Post by machinc »

I have the same problem. Please post solution in this forum.
User avatar
GevinKe
TM Product Manager
Posts: 251
Joined: 08 Dec 2023, 10:27
China

Re: [Help] Duple Backup cant be restored

Post by GevinKe »

machinc wrote: 23 Sep 2025, 03:29 I have the same problem. Please post solution in this forum.
Sorry for the inconvenience.

Did you encounter a restore failure, or is it the same situation as described above? To help us troubleshoot more efficiently, could you please provide the following information:
  • Your TOS version
  • Your DB version
  • What are your backup source and destination?
  • Which backup mode are you using?
Please note: Except for Hybrid Mode, other backup modes do not support restore operations.
(Incremental, Mirror, and Multi-version backups generate non-encrypted files, which can be accessed directly without using the “Restore” function.)

If you are using an earlier DB v2.0 version with Hybrid Mode backups, you can perform restore using the old method, as shown in the image below.
Image
To contact our team, please send email to following addresses, remember to replace (at) with @:

Technical team: support(at)terra-master.com(for technical support)
Service team: service(at)terra-master.com(for purchasing, return, replacement, RMA service)
User avatar
machinc
Posts: 4
Joined: 23 Sep 2025, 03:27
Belgium

Re: [Help] Duple Backup cant be restored

Post by machinc »

So you are saying that Duple is not a backup solution. You cannot restore files from previous histories. Waste of time then.
User avatar
GevinKe
TM Product Manager
Posts: 251
Joined: 08 Dec 2023, 10:27
China

Re: [Help] Duple Backup cant be restored

Post by GevinKe »

machinc wrote: 28 Sep 2025, 01:07
Hello,
Since you previously only mentioned that the restore failed, we still need more related information in order to accurately troubleshoot the issue. At the same time, to make it clearer for you, here is a brief explanation of the design differences between different backup modes:

Currently, except for the Hybrid mode, other modes (such as Incremental, Mirror, and Multi-Version) generate non-encrypted backup data, which can be accessed directly. Therefore, these modes do not provide a “Restore” function—not because restore is impossible.

We are always committed to assisting you in resolving issues. Even if the data comes from backups created with an earlier version, we can still provide the corresponding legacy application support to help you restore your data.
To contact our team, please send email to following addresses, remember to replace (at) with @:

Technical team: support(at)terra-master.com(for technical support)
Service team: service(at)terra-master.com(for purchasing, return, replacement, RMA service)
User avatar
delinend
Posts: 4
Joined: 14 Oct 2025, 17:22
Denmark

Re: [Help] Duple Backup cant be restored

Post by delinend »

Is it possible to disable encryption/chuck in Hybrid-mode ? I want RAW backup files on the destination NAS, so I can access the files directly.

I want a simple increment backup system, with RAW files and Version retention. Strange.. all other NAS have this backup solution, but not on TerraMaster :-(

And Hybrid mode is 10x slower on transfer.
User avatar
CursaYang
TM Support
Posts: 740
Joined: 06 Jan 2025, 16:34
China

Re: [Help] Duple Backup cant be restored

Post by CursaYang »

Hello, if you just want to back up unencrypted source files and keep historical versions, you can choose Terrasync for backup.
What is your device model and system version?
To contact our team, please send email to following addresses, remember to replace (at) with @

Technical team: support(at)terra-master.com(for technical support)
Service team: service(at)terra-master.com(for purchasing, return, replacement, RMA service)
User avatar
delinend
Posts: 4
Joined: 14 Oct 2025, 17:22
Denmark

Re: [Help] Duple Backup cant be restored

Post by delinend »

I have 2x F6-424max with 80TB on each, and 60TB data I have to backup from NAS1 to NAS2
Around +1 millions files, so I can't use Terrasync, with the limitation of 160.000 scan files pr. task.
Post Reply

Return to “Duple Backup”