Snapshot Replication is used to protect shared folders and LUNs with snapshots, which help against accidental deletion, corruption, and viruses/ransomware. You can:
- take manual snapshots,
- enable scheduled snapshots,
- restore data from snapshots,
- and set up replication to another Synology server.
From the knowledge base:
- Snapshot Replication lets you take snapshots of shared folders as often as every 5 minutes.
- You can retain up to 1024 snapshots per shared folder and up to 65536 snapshot versions across all shared folders.
- It supports shared folders on Btrfs volumes.
- Ransomware protection in Active Insight is provided by Snapshot Replication, and it can capture a maximum of one snapshot per shared folder daily in that context.
What the knowledge base does say:
- Use Snapshot Replication to create and manage snapshots.
- Configure scheduled snapshots and retention settings.
- If needed, create replication tasks to sync snapshots to a destination server.
- You can restore a shared folder to a previous version from snapshots.
What it does not provide here is a step-by-step setup wizard or exact DSM clicks for enabling it, so the knowledge base has no more detailed answer yet.
Sources used: [1], [3], [7], [9]