Suddenly I can NOT take Time Machine BackUps on my Synology NAS

I have the latest iMac M4 with Tahoe and I'm taking Time Machine BackUps on my Synology DS415play.

Recently Apple announced that she would no longer support afp but only smb, so I changed everything on my NAS to SMB. Since then, Time Machine connects to my disk, but it can not take a backup returning message "Try taking a backup when diskstation.local is available". Can you help ?

Posted on Oct 30, 2025 10:38 AM

Reply
Question marked as Top-ranking reply

Posted on Oct 30, 2025 6:41 PM

Hi,

To fix Time Machine backups to a Synology NAS, first ensure the NAS is using the latest DSM updates and has sufficient space. Next, check that the SMB settings are correctly configured (SMB3 maximum protocol, Opportunistic Locking, SMB2 lease, SMB durable handles enabled) and that Bonjour services are enabled for Time Machine broadcasts via SMB. You may also need to troubleshoot your Mac by restarting it, disabling iCloud Drive temporarily, or creating a new shared folder on the NAS for Time Machine backups. 


2 replies
Question marked as Top-ranking reply

Oct 30, 2025 6:41 PM in response to zografos.sotiris

Hi,

To fix Time Machine backups to a Synology NAS, first ensure the NAS is using the latest DSM updates and has sufficient space. Next, check that the SMB settings are correctly configured (SMB3 maximum protocol, Opportunistic Locking, SMB2 lease, SMB durable handles enabled) and that Bonjour services are enabled for Time Machine broadcasts via SMB. You may also need to troubleshoot your Mac by restarting it, disabling iCloud Drive temporarily, or creating a new shared folder on the NAS for Time Machine backups. 


Suddenly I can NOT take Time Machine BackUps on my Synology NAS

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.