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I have a daily rsync job that mirrors all data from NAS1 to NAS2. This worked for years. For a few days, I see these messages in my log file: At first I thought it would work the next day again, so I waited for that. Same result. Then I started the job manually but it failed as well. I searched for more detailed information in the web interface, but there is only the response of the rsync job in the task planner and the same message in the maintenance protocol. Not helpful.
I logged in to SSH and did not find much either. There is no entry in the crontab at the scheduled time of the day which I expected. I searcheed for /var/log/messages but that file does not exist. Where do I need to look for? I did not find any log file for the rsync jobs or files for the raw configuration that is written when the job is created in the web UI.

As the web interface is lacking all edit and almost all view methods to inspect the job that worked for years, I disabled that one and set up a new one. It took twelf hours to copy files from NAS1 to NAS2 and finished with a 'successful' message. I checked the files: NAS2 had ca. 80% of data before setting up the new job, now it has about 85% of the data received from NAS1. There are files that exist with the same date stamp and protection bits in source and target but the file size differs a lot, e.g. 127GB on NAS1 but only 9GB on NAS2. This is definitely not what rsync can call 'successful'.

Where can I find log files on the rsync job that might tell me why the old job stopped working and the new one did synchronize only 90% of the data?

When backup [rsync] error starting client-server protocol

Long shot. is port 873 occupied?

Yes, it looks like this:

Right. Did you recently install the BackupPlaner package? It installs a daemon 'zysync', which is an adapted, but incompatible version of rsync, which occupies the rsync port. In that case you can uninstall the BackupPlaner, kill zysync before you start your script, or use another port.

No, I did not install any packages for years. In fact I did not install a single of these apps in App Center ever although it keeps nagging me all the time to update myZyXELcloud-Agent which I cannot get rid of. There is an icon "Sicherungsplaner" on the desktop which translates to "Backup Planner". It has an external harddrive icon with a Time Machine symbol on it. But this has been there from the start when I bought the NAS years ago, and this is the sync mechanism that I used from the beginning. So I don't know if this is what you are talking about or if there is another BackupPlaner somewhere.

Meanwhile I deleted all user files on the second NAS, set up a new sync job in this "Sicherungsplaner" and again: it does not copy certain files and directories. Some large files have been copied only at a fraction. Until about a month ago, source and destination have been in sync.

So is it the "Sicherungsplaner" icon that you are talking about? Shall I disable the new (only) active job there and use a cronjob instead? Or is there any reliable setting for the web frontend synchronisation?

I'm sorry, I'm at the edge of my knowledge. Years ago I looked at the backup planner for my backups, but it's incremental backups are not really usable. The first backup is a .dar file, and the incremental backups are smaller .dar files. No easy way to extract a single file. So I decided to use rsync, initiated from a Debian box, and found that zysync was conflicting. Zapped that, and problem solved. I haven't looked at the build-in possibilities any further.

Here someone has the same problem, and it's related to an unexpected tab character.

it keeps nagging me all the time to update myZyXELcloud-Agent which I cannot get rid of.

My 'Tweaks' package has a tool to disable the automatic ZyXELcloud-agent installer.