Note: This is not a solution to the problem but provides some insight into what is happening.


I followed the instructions for Quick Apple Raspberry Pi Machine and formatted a hard drive to HFS+ and installed netatalk on a Raspberry Pi 3B clone; everything worked fine.

I went into Time Machine settings and the network drive was recognized and added. Since this was over ethernet, the backup took about 13 hours to complete.

I did try connecting the drive to my Archer AX50 and configured the settings for a Time Machine shared drive. Time Machine did not see the drive. This seems logical since the router shares the drive using Samba/SMB, not netatalk.

Conclusion:

A recent update to macOS Sonoma has broken the ability for Time Machine to see a network drive; this is probably somewhere within the Samba/SMB protocols implemented by Apple.

Answer from agarza on Stack Exchange
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Apple Community
discussions.apple.com › thread › 255056109
No Available Time Machine Destinations - Apple Community
August 12, 2023 - Time machine Unable to reach the time machine via Icon. I am also receiving error messages in the system settings "No available time machine destination." My backup drive appears to be working as I can see in the system settings a backup and time.
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Where has the Time Machine gone?
If Time Machine is missing, it might be due to a disconnected backup drive or a system glitch. Try reconnecting your backup disk or restarting your Mac to resolve the issue.
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4ddig.tenorshare.com
4ddig.tenorshare.com › mac recovery solutions › 4 best ways to fix no available time machine destinations
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How do I get to Time Machine settings?
To access Time Machine settings, go to the Apple menu > System Preferences > Time Machine. From there, you can manage backup options and restore files.
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4ddig.tenorshare.com › mac recovery solutions › 4 best ways to fix no available time machine destinations
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Why has Time Machine stopped backing up?
Time Machine may stop backing up if the backup drive is full, disconnected, or there’s a software issue. Ensure your disk has enough space and is properly connected to your Mac.
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4ddig.tenorshare.com › mac recovery solutions › 4 best ways to fix no available time machine destinations
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easeus.com › mac file recovery › no available time machine destinations | fixed in proven ways
No Available Time Machine Destinations | Fixed in Proven Ways
1 month ago - If this is the scenario, restarting the Mac is the best solution to fix any glitches causing this problem. Restarting your Mac refreshes the memory, resolves minor glitches, and reboots several background procedures.
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Tenorshare 4DDiG
4ddig.tenorshare.com › mac recovery solutions › 4 best ways to fix no available time machine destinations
4 Best Ways to Fix No Available Time Machine Destinations
December 13, 2024 - Insufficient Disk Space: If the backup disk lacks sufficient storage, Time Machine may fail to initiate backups or recognize it as a valid destination. ... Attempting to fix these issues yourself may cause complications or data loss.
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Apple Community
discussions.apple.com › thread › 255963656
Time Machine no available destinations - Apple Community
February 9, 2025 - Last week I need to modify the space quota in one of them, so I deleted the volume and made another one with more quota. The problem is that when setting the new disk in Time Machine it shows the message "no available destinations". It doesn't find any of the 4 APFS volumes created.
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Reddit
reddit.com › r/truenas › no available time machine destinations while using truenas scale
r/truenas on Reddit: No Available Time Machine Destinations while using TrueNAS Scale
August 17, 2024 -

Edit: Turns out, I had forgotten to enable "Multi-user Time Machine" under the "Purpose section for the SMB settings. After I enabled that, it works.

Hello all,

I followed this guide - https://www.reddit.com/r/truenas/comments/11gmee8/truenas_scale_22121_time_machine_backup/ to set up a backup for my 2021 M1 MBP running Sonoma 14.5. I can find the server under "Locations" in finder and can connect to it (I connect to it using my Mac's username and password). And I can see the different folders that I have made in the dataset. But, when I select "Add Backup Disk" in system settings, I get the error "No Available Time Machine Destinations"

I found this post - https://www.truenas.com/community/threads/smb-mdns-service-discovery-broken-macos-ventura-can-no-longer-see-truenas.112643/page-2#post-803897 and did what he recommended which was to disable and enable mDNS under Network > global > settings. I also set up a cron task to restart avahi daemon, but no luck. I also restarted the server and the laptop.

Thanks in advance!

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SNBForums
snbforums.com › wi-fi networking › asus wi-fi › asuswrt-merlin
Time machine support when AFP is removed from macOS? | SNBForums
May 14, 2025 - It may not display this or other websites correctly. You should upgrade or use an alternative browser. ... In the recent macOS Sequoia 15.5 update, Apple has deprecated AFP: 'Apple Filing Protocol (AFP) client is deprecated and will be removed in a future version of macOS.' Currently Time Machine support works only over AFP as Time Machine does not see SMB shares.
Find elsewhere
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JustAnswer
justanswer.com › mac-computers › b2fl1-no-destination-select-when-trying-restore.html
I have no destination to select when trying to restore my macbook pro from an external hard drive I backed up with time
When no destination appears during a Time Machine restore, ensure the internal drive is properly formatted (APFS or Mac OS Extended). Use Disk Utility to verify and repair the drive.
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The Eclectic Light Company
eclecticlight.co › 2022 › 11 › 09 › disk-utility-and-time-machine-in-ventura
Disk Utility and Time Machine in Ventura – The Eclectic Light Company
November 9, 2022 - Time Machine’s controls aren’t perhaps as obvious as they could be: two commands that you might not know how to access are to back up with a consistency scan, and browse other backup disks. These are available in Time Machine’s menu (enabled in Control Centre) with the Shift or Option key held down, respectively. I’m grateful to kapitainsky for pointing out one bug in the Time Machine app: if you use the Restore To… command, you won’t be prompted to select a destination to be used to restore the file, and it will be restored to its original location only.
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Apple Community
discussions.apple.com › thread › 255306498
No available TimeMachine destinations on … - Apple Community
TM will see the new share and let me select it to be used and will start connecting to it, then it will abort saying "The backup disk image could not be created". Leaving some .sparsebundle files as garbage. All permissions and other settings on the DSM are exactly the same as the previous Share Folder as well as a couple other TM-enabled volumes (for other Macs). So it seems Ventura means the end for using Time Machine with an DSM Synology NAS.
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Apple Community
discussions.apple.com › thread › 255997320
How do I fix 'No available Time Machine d… - Apple Community
March 6, 2025 - I haven't used it for a while. I accidentally deleted an important file and want to restore it, but now I can't even open the app. When you open this window, it shows "Add backup disc." It shows "No available Time Machine destinations." And there is only one option—close.
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Apple Community
discussions.apple.com › thread › 255567823
Why does Time Machine settings not see a … - Apple Community
If the router runs a file server that supports the “Time Machine over SMB” specification it might work, but it is still not supported by Apple. The network drive format is irrelevant. A network backup is stored in a Sparse Bundle disk image which is formatted appropriately for a Time Machine backup. All that being said, try mounting your Time Machine share in Finder, then try adding it as the Time Machine destination disk.
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Apple Support
support.apple.com › guide › mac-help › if-time-machine-cant-find-your-backup-disk-mh15141 › mac
If Time Machine on your Mac can’t find your backup disk - Apple Support
Open Time Machine settings and reselect your backup disk. If you erased your backup disk and began having trouble, reselecting it may fix the problem. If you’re using a Time Capsule as your backup disk, use AirPort Utility to make sure it’s set up properly and connected to your network.
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EaseUS
easeus.com › mac backup and recovery › time machine can't find backup disk - top 5 ways to fix it!
[5 Quick Fixes] Time Machine Can't Find Backup Disk - EaseUS
1 month ago - The following are some common ways to help you solve this issue. Let's come to the details. Way 1. Try Basic Troubleshooting Tips · Way 2. Restart Your Mac · Way 3. Reselect Time Machine Preferred Backup Disk
Top answer
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This is from an Apple Support article:

If your network server or NAS device supports Time Machine Bonjour notifications, you can set up Time Machine backups even if you are not connected to the server. If your server does not support Time Machine Bonjour notifications, you may still be able to set it up as a Time Machine destination by connecting to the server using SMB and then selecting the mounted network disk. After you set up the network disk in Time Machine settings, Time Machine automatically reconnects when it’s time to back up or restore your data. If your backup disk is on a network, the network server can use SMB file sharing. (Your Mac must be connected to the SMB server when you set up Time Machine.) After you select the network disk in Time Machine settings, Time Machine automatically connects to the disk when it’s time to back up or restore your data.

https://support.apple.com/en-mn/guide/mac-help/mh15139/mac#:~:text=If%20your%20backup%20disk%20is,up%20or%20restore%20your%20data.

Windows does not advertise shares over Bonjour, so they won't automatically appear in the list of possible backup destinations in Time Machine settings. If, after manually mounting the share in the Finder, it still doesn't appear, try the steps in this article:

https://www.imore.com/how-use-time-machine-backup-your-mac-windows-shared-folder

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So you’ve already created an SMB file share from what I can tell. The missing piece is using your Mac to create a sparsebundle disk image using Disk Utility and placing it on your SMB share. Once you mount that you should be able to select it as your backup destination.

I followed the directions here to get it working - https://www.imore.com/how-use-time-machine-backup-your-mac-windows-shared-folder

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WD Support
support-en.wd.com › app › answers › detailweb › a_id › 32004 › ~ › steps-to-resolve-time-machine-backup-disk-not-available,-finder-connection
Steps to Resolve Time Machine Backup Disk Not Available ...
September 18, 2025 - Fix Time Machine backup errors on My Cloud by switching from AFP to SMB and reconnecting the backup disk.*END · Backup disk not available or Finder Connection Error while accessing a My Cloud OS 5 or My Cloud Home. APFS is no longer supported.
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Isobel Lynx
isobellynx.com › home › articles › magitech as a service › when time machine can’t find destination of a newly installed internal hard drive
When Time Machine can’t find Destination of a newly installed internal hard drive
September 6, 2022 - Now you may click Restore from Time Machine backup. You’ll get Select Restore Source screen – Select your external hard drive. You’ll get Select Backup screen. On top, from the dropdown you may have to choose which mac you’re bringing back to life (applicable if the external hard drive was used to backup more than one mac). Choose the latest backup (or earlier if you wish). You’ll get Select Destination ...
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Stellar Info
stellarinfo.com › home › no time machine backup found: learn to recover lost data on mac
How to resolve No Time Machine Backups Were Found Issue?
May 13, 2025 - This will ensure the mounted disk drive is fully accessible to the Mac. Here’s what to do – · Open System Settings on your Mac. Navigate to General > Time Machine. If the Time Machine backup drive is visible, select it and click ‘–’ ...