Synology to QNAP
The DS109+ backup job setup in Figure 6 looks very similar to the one for the NV+ shown in Figure 3. Like the NV+, QNAP adds an entry to its rsyncd.conf file for each share created, so that each share is also an rsync module. So I just created a share called rsynctarget, used the admin username and password and entered the TS-109 Pro's IP address.
Figure 6: Backup to QNAP settings
Setup for the rsync target share on the QNAP was easier than for the NV+. I just created the share; QNAP doesn't control folder access for individual services.
Figure 7: QNAP Share setup
Once setup was complete, I just returned to the Synology Backup page, selected the Backup job and clicked the Back Up Now button (Figure 8). The backup ran without a hitch, with throughput of 3.65 MB/s. Since the TS-109 Pro is much slower than the DS109+, I'm guessing it is what is setting the slow pace of the rsyncs.
Figure 8: Starting Synology Backup
So the Synology and QNAP are pretty compatible as rsync partners. Each has a few unique features—the QNAP, its file compression and the Synology its block-level transfer. But the Synology also has an edge over the QNAP in that it can be scheduled to run its backup multiple times per day.
Figure 9 shows the Synology Advanced Schedule page. You can schedule backups anywhere from every 1 to 15 hours, establish a start and end window and total number of backups. This gives it the edge over the QNAP in replacing the NV+ for backup duties, since it also can run multiple backups per day.
Figure 9: Synology Advanced backup schedule
But both the QNAP and Synology NASes are a bit on the expensive side, if all you want is NAS-to-NAS backup. Next time, I'll see if a WD My Book World Edition can provide a cheaper rsync target alternative.