Does Hybrid Backup Sync (HBS) always perform a full backup every time?
Last modified date:
2025-09-10
Applicable Products
Hybrid Backup Sync (HBS)
Solution
No, Hybrid Backup Sync (HBS) does not always perform a full backup each time a backup job runs.
- By default, the first backup to a destination is a full backup. This copies all selected data to the target location.
- All following backups are incremental backups. Only new or modified files are transferred after the first run, saving time and bandwidth.
What is QuDedup and how does it optimize HBS backups?
QuDedup is an advanced feature of HBS that performs block-level data deduplication before backup. When QuDedup is enabled:
- The first backup is still a full backup, stored in a
.qdfffile on the destination. - Subsequent backups are incremental, transferring and updating only unique data blocks within the
.qdfffile. - When files are deleted on the source, HBS simply marks them in the backup rather than transferring all data again. You can choose whether to restore deleted files later.
- We recommend enabling multi-versioning to keep multiple restore points for added data protection.
Performance Example
Example Test (HBS v19.0.0303, 140K files / 1.45TB, backup from TES-1885U to TS-1635AX):
| Network Bandwidth | QuDedup disabled | QuDedup enabled |
|---|---|---|
| 1GbE | 96.91 MB/s | 96.82 MB/s |
| 10GbE | 183.16 MB/s | 108.77 MB/s |
Note: Enabling QuDedup may reduce backup throughput on high-speed networks, but can reduce storage usage and increase backup efficiency.
