ReadyNAS Rsync to FreeNAS

I didn't have an old RAIDiator NAS handy to test this out with, so I used the RAIDiator VM with v4.2.23.  Should be about the same.  FreeNAS is at 9.3 STABLE.

Here's how I configured:

On the FreeNAS side:

• Created a ZFS volume called "tank"
• Created a CIFS share called "test" to point to "/mnt/tank/test"
  This also created the directory for me.
• Permissions on "/mnt/tank/test" defaulted to being owned by root:wheel.
  I popped open a shell via the UI and did a "chown nobody:nogroup /mnt/tank/test".
• Configured an rsync "module" called test pointing to /mnt/tank/test
  An rsync "module" is basically a share.
  User and group are set to nobody:nogroup, just like the permissions above.
• Ensure that "rsync" is enabled under "Services"

On the ReadyNAS side:

• Create backup job:
• Source: Share (backup)
• Destination: (Remote: Rsync Server)
  Host: IP address of FreeNAS
  Path: test (same as the rsync module)

Hit "Go" on the ReadyNAS side to start the backup job and I had a successful run.

Just going on the information you provided I'd say you're probably running into a permissions related issue.

User/group "Grunbay", as you set in your initial post, needs to have permission to this folder.

Without changing the ownership on the "test" folder I created in FreeNAS I got the following message back from the ReadyNAS backup log:

Reason for failure:
Error encountered copying data from source path /backup/ ==> 10.200.101.159::test due to permission denial on one or more files.