macOS 26 Tahoe Time Machine backups

macOS 26 Tahoe Time Machine backups Time Machine backups not working on my NAS Synology. I use SMB. Sparsebundle is created on my NAS time machine folder but after preparng it ends with a message "backup disk is not available - try again"


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MacBook Pro 16″, macOS 26.0

Posted on Sep 23, 2025 6:49 AM

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Posted on Sep 23, 2025 6:54 AM

Another user reported feedback from Synology indicating that special characters in the name of the backup are the problem, Sequoia tolerated them but Tahoe does not. For example, John_Backup would be fine but Jøhn_Backup would not.


See here, for example: Time Machine NAS bug is back? - Apple Community


Probably explains why some people are having issues whereas my TM backups to a Synology DS223j have been working fine on Tahoe.


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Question marked as Top-ranking reply

Sep 23, 2025 6:54 AM in response to davidfromsobotka

Another user reported feedback from Synology indicating that special characters in the name of the backup are the problem, Sequoia tolerated them but Tahoe does not. For example, John_Backup would be fine but Jøhn_Backup would not.


See here, for example: Time Machine NAS bug is back? - Apple Community


Probably explains why some people are having issues whereas my TM backups to a Synology DS223j have been working fine on Tahoe.


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macOS 26 Tahoe Time Machine backups

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