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I have a directory on NAS A that I want to mirror itself onto the same directory on NAS B.
I don't think I want changes on the NAS B directory making their way back to NAS A.
Both NAS A and NAS B are on the same local network
(Physically in separate buildings in case that matters at all.)
One option is to set up an rsync backup job that runs periodically.
My own backup plan has rsync backup jobs for each share running on each destination NAS (NAS B in your case) that run on a schedule. I do this because the destinations are on power schedules.
If both NAS are always running, then it is probably best to run the backup job on the source (NAS A). Then the source will make a temporary snapshot and then back up the snapshot. That ensures coherency.
There is a setting in the ReadyNAS rsync backup jobs to delete any files on NAS B that are no longer on NAS A. That is set on my systems, and I also have custom snapshots set up on the destinations so I can roll back to older versions of the files and folders if that is needed.
This of course is not a true "sync", as the destination is updated on a schedule, and not as files change.
Another option that doesn't require a cloud is Resilio Sync. This is in the Netgear app store (free), but the version there is old (2019). The current version (2022 March) is here: https://help.resilio.com/hc/en-us/articles/206179364-Netgear
I've used this with PCs and mobile devices, but never run it natively on a ReadyNAS. So I don't know if it will meet your use case or not. But it is free to try.
I have a directory on NAS A that I want to mirror itself onto the same directory on NAS B.
I don't think I want changes on the NAS B directory making their way back to NAS A.
Both NAS A and NAS B are on the same local network
(Physically in separate buildings in case that matters at all.)
One option is to set up an rsync backup job that runs periodically.
My own backup plan has rsync backup jobs for each share running on each destination NAS (NAS B in your case) that run on a schedule. I do this because the destinations are on power schedules.
If both NAS are always running, then it is probably best to run the backup job on the source (NAS A). Then the source will make a temporary snapshot and then back up the snapshot. That ensures coherency.
There is a setting in the ReadyNAS rsync backup jobs to delete any files on NAS B that are no longer on NAS A. That is set on my systems, and I also have custom snapshots set up on the destinations so I can roll back to older versions of the files and folders if that is needed.
This of course is not a true "sync", as the destination is updated on a schedule, and not as files change.
Another option that doesn't require a cloud is Resilio Sync. This is in the Netgear app store (free), but the version there is old (2019). The current version (2022 March) is here: https://help.resilio.com/hc/en-us/articles/206179364-Netgear
I've used this with PCs and mobile devices, but never run it natively on a ReadyNAS. So I don't know if it will meet your use case or not. But it is free to try.
