I'm not sure if this is a macos issue or synology one, but just wanted to check if anyone else had the same problem.

Prior to updating to Sequoia, I followed this tutorial on setting up my mac to backup to my nas using time machine. It worked fine, the only issue was that I'd occasionally get notifications from my nas about exceeding the number of logins, which was my mac trying to backup. I'm still not sure why I was getting the warnings, but it would work in the end.

Since upgrading to Sequoia I get the same warnings, log center is showing that my mac has accessed the shared folder that I set up for time machine, but then my mac says backup failed and "The network disk disconnected from your mac while backing up".

I followed the steps in the video again from scratch and deleted the old backups but no luck. There is more than enough free space and the nas and mac are on the same network.

Has anyone had a similar issue and been able to solve it? Thank you.

edit: Thanks to u/s_p_lee for pointing out that it seems to be a known issue and turning the firewall fixes it. Not a permanent solution, but hopefully it's an easy fix for apple to make.

FIX: It looks like it has been fixed in Sequoia 15.1.

Anyone have any experience (good or bad) they can share about using a Synology for Time Machine backups over wifi? I am considering buying a Synology DS223 or maybe DS220+. I have no plans to stream media from it. I'm mostly interested in running Time Machine backups from a couple MacBooks that are not on wired ethernet. Maybe tinker with some of the other capabilities of the NAS.

Curious about how long Time Machine backups might take (when run regularly; i'm fine with the first backup taking a long time)... How well macOS works with Synology NAS. Basically just overall experiences.

EDIT: Thanks for the replies. Sounds like overall people have had good experiences with Synology and Time Machine.

Hi,

I use Time Machine - I have Sonoma - with a Synology NAS.

Unfortunately it work unreliable. Sometimes it works for two weeks without a problem then suddenly I get the red exclamation mark. - When I start a backup manually, it takes a long time at the "Preparing backup" stage. To get it working again, I delete the Time Machine Folder on the Synology NAS and the backup target in Time Machine - Then it works again.

But I don't want to do that every month or so.

Bonjour broadcast is on for SMB only.

Any setting to change on the Synology NAS?