Snapshot Replication Technical Specifications

Snapshot Replication

Features

Schedulable and near-instantaneous data protection
Supports various replication topologies for different scenarios, including active-active, extended replication, one-to-many and hub-to-spoke
Fast data recovery on the disaster recovery site
Supports snapshot features for shared folders in Btrfs volumes and LUNs, including schedule, management, browse, and recovery
Supports immutable snapshots (check supported models)
Supports snapshot preview and file copy in File Station
Supports snapshot preview, file copy, and recovery in Windows File Explorer

Specifications

Customizable snapshot and replication schedules
- A snapshot can be taken every 5 minutes
- A replication task for a shared folder can be executed every 5 minutes
- A replication task for a LUN can be executed every 15 minutes
Maximum number of snapshots
- 65,536 snapshots per system (shared folders and LUNs combined)
- 1,024 snapshots per shared folder
- 256 snapshots per LUN
- The exact limits vary by model. For details, refer to your Synology product's software specifications
- While keeping excessive snapshots can impact storage efficiency, deleting them in bulk to reclaim space may also affect performance. It's recommended to manage snapshots by deleting them on a regular basis
Maximum number of replication tasks
- 128 tasks per system (shared folders and LUNs combined)
- 128 total asks for all shared folders
- 64 total tasks for all LUNs
- The exact limits vary by model. For details, refer to your Synology product's software specifications
Customizable retention rules for snapshot management
- Smart Retention policy
- Number of latest snapshots to keep
- Keep all snapshots for
Customizable protection periods for immutable snapshots. During the protection period, snapshots and their corresponding shared folders or LUNs are protected and cannot be deleted
Customizable number of concurrent tasks for better system resource allocation
Customizable IP addresses and ports for data transfer in replication tasks, as well as priority network interfaces
Supports importing the initial replication data to the destination server with an external storage device to reduce the replication time
Replication transmission encryption
Verification tests on site recovery
Additional features for shared folders
- Snapshot size calculation for space management
- Online preview of snapshot content and single-file downloads from snapshots
- Restoration of files and folders using Windows Previous Versions

Limitations

Taking or replicating snapshots is not supported for shared folders with less than 100 MB of available volume space
Taking or replicating snapshots is not supported for LUNs with less than 1 GB of available volume space
NFS permission cannot be recorded in snapshots
Data in the recycle bin is recorded in snapshots
Encrypted shared folders do not support online preview of snapshot content
Shared folders included in a Synology Tiering task do not support replication tasks
When shared folders or LUNs have replication tasks in place, the latest snapshots sent to destination servers cannot be deleted
Each one-to-many/extended replication can support up to three different destination sites
The "homes" shared folder does not support the following operations: restore to this snapshot, switchover, failover, forced failover, test failover, and re-protect
WriteOnce shared folders do not support restoring from this snapshot
WriteOnce shared folders in Compliance mode do not support switchover and re-protect
The number of concurrent tasks is only configurable on models with more than 2 CPU threads (Learn more about each model's CPU threads)