Title: SuperDuper scheduled backups running much longer after macOS Tahoe 26.2

Title: SuperDuper scheduled backups running much longer after macOS Tahoe 26.2

I’m trying to understand a repeatable scheduling and performance issue involving SuperDuper on macOS Tahoe 26.2, and I’m wondering whether anyone else is seeing something similar.

I’ve been using SuperDuper for over 10 years across multiple generations of Macs and versions of macOS. Throughout that time, I’ve always scheduled it to run Monday to Friday at 11:55 pm. The backups were small incremental updates and typically completed in 5–10 minutes, very reliably, with no issues.

After updating to Tahoe 26.2, the behaviour changed noticeably:

• 
  
• On the first night after the update, the backup ran for about 13 hours.
• 
  
• 
  
• I assumed this might be a one-time re-indexing or system-level change related to the OS update.
• 
  
• 
  
• However, on the following two days, backups again took 8 hours and 6.5 hours respectively, despite no meaningful new files being added to the source drive.
• 
  

The backups do eventually complete successfully, but two things are now unclear:

• 
  
• The runtime is dramatically longer than it was prior to Tahoe 26.2
• 
  
• 
  
• The reported start time does not seem to match the configured schedule, making it unclear what is triggering the job or why the timing appears to drift
• 
  

I’ve already contacted SuperDuper support, and they suggested the issue is likely outside their control.

At this point, I’m trying to determine whether this is:

• 
  
• A macOS Tahoe 26.2 issue (for example, changes to indexing), or
• 
  
• 
  
• Something others are encountering with SuperDuper or other third-party backup tools on Tahoe
• 
  

If anyone here is using SuperDuper on Tahoe 26.2 and has noticed unusually long backup times or scheduling irregularities, I’d really appreciate hearing about your experience.

Thanks in advance — I’m just trying to understand whether this is an isolated case or something more systemic.