This page allows system administartors to manage replications. You can create, edit, and delete replication tasks. You can also run/stop the syncing and view the information of your replication tasks.
You can create multiple replications for a shared folder/iSCSI LUN to multiple destination servers, forming a one-to-many scheme. You can also create an extended replication for a replicated shared folder/iSCSI LUN, forming an extended scheme.
This option provides an ideal solution to help you specify the maximum amounts of snapshot versions to save your volume space, but you may need to retain your snapshots for longer periods of time.
Synology employs the GFS, or Grandfather-Father-Son retention policy. You can configure the maximum amounts of snapshot versions to be retained for the following time ranges respectively: hourly, daily, weekly, monthly, and yearly.
Data Protection Manager will retain as many as the configured maximum number of snapshots for every time range. If more than one snapshot verison exists within a time range, only the earliest one will be kept. For example, if you set a policy as 10 weekly snapshot(s), Data Protection Manager will retain the earliest snapshot (if more than one snapshot is taken in a week) for each of the latest 10 weeks.
Moreover, all snapshot versions within one hour since the taking of newest snapshot will be kept by default, for your convenience to find and restore from recent snapshot versions. You can also lock a snapshot to prevent it from automatic removal by your retention rules.