Time Machine is not backing up on Tahoe 26.2

Just to add

Not using TM Backup ( at this time ) to an attached External Drive

Yes, backing up to an attached External Drive using a Third Party application called Carbon Copy Cloner

This machine was update to Tahoe 26.2 Saturday very early hours of morning

Ran the CCC backup by about 11:00 AM Saturday and had zero issues whatsoever

https://support.bombich.com/hc/en-us/articles/20686487352599-How-to-set-up-your-first-backup

https://support.bombich.com/hc/en-us/articles/20686449773847-How-to-schedule-a-backup

jvox1_0 wrote:

Same here... M3 Macbook Pro on Tahoe 26.2... Using my NAS for Time Machine worked before the upgrade now it doesn't... apple fix this please!

Certain misconceptions that persist regarding the relationship between Apple Computer and third-party devices, accessories.

These misconceptions often arise when third-party products fail to function or meet user expectations.

Apple is responsible for addressing issues with its own services, applications, operating systems, and accessories.

However, Apple cannot rectify user choices of third-party products  installed and used on their computers.

This responsibility lies solely with the third party to evaluate the performance of their products when used on an Apple Computer running the intended version of macOS.

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jvox1_0 wrote:

If it worked before and nothing changed on the hardware end, then the UPDATE broke it...

Why do you assume that any and all 3rd party software and hardware that run properly on the current version of macOS will also run properly on a newer version of macOS? The UPDATE may break compatibility with the 3rd party software/hardware, but it is not Apple's responsibility to ensure that macOS remains compatible with 3rd party products, it is the developer's/manufacturer's responsibility to ensure that their products continue to work. That's the point of beta versions of the software.

Since you post no details about your problem ('it doesn't work' doesn't comprise details) except that your problem is different than that of the OP, you are not likely ro receive helpful suggestions here. So your options remain

1. Contact your NAS vendor
2. Contact Apple Support
3. Wait and hope Apple fixes the problem you think they caused

For me, hope is not a plan. Might work better for you. Good luck.

Backing Up to an external drive or NAS? What happens when it “doesn’t work”? Not start? Not complete? Give an error message?

TM just completed a backup of my M4 Pro MBP on 26.2 to my Synology NAS after I updated this morning.

Updated my M2 Max MBP to Tahoe 26.2, now I can't get Time Machine to work. I've tried the usual steps to no avail. Anyone else have this problem and/or a fix?

What were the “usual steps?”

What is the backup destination and how is it connected?

The OP’s issue was resolved, and TM backups to my NAS work fine on 26.2. Not sure that there’s anything for Apple to fix with macOS. If you want Apple’s help to fix a problem with your Mac, contact them.

Official Apple Support

I've received several "only via email" replies that go like this... "not apple's fault this didn't work, it's the third party hardware vendor... ", "Original poster said his is fixed" , etc. totally unhelpful. If it worked before and nothing changed on the hardware end, then the UPDATE broke it...and original poster had a slightly different question...

Same here... M3 Macbook Pro on Tahoe 26.2... Using my NAS for Time Machine worked before the upgrade now it doesn't... apple fix this please!