🌐
TrueNAS Community
truenas.com › forums › truenas core
Time Machine backups fail with error "The selected network backup disk does not support the required capabilities." | TrueNAS Community
May 17, 2022 - In SCALE we've deprecated support for it.
Time Machine - Backup Disk Not Available Jan 7, 2020
6y ago
TrueNAS 26.0.0-beta1 time machine fails May 19, 2026
last mo.
25.10.3 Fixed my Time Machine Backups Apr 17, 2026
2mo ago
TrueNAS Fangtooth RC: Time Machine backups not working (not multi protocol) Mar 28, 2025
last yr.
Initial Time Machine backup fails with Tahoe Dec 7, 2025
7mo ago
More results at truenas.com
🌐
TrueNAS Community
forums.truenas.com › truenas general
Can not connect TimeMachine share - The selected network backup disk does not support the required capabilities - TrueNAS General - TrueNAS Community Forums
April 21, 2024 - I setup a TimeMachine SMB share ... Apparently this is a very common issue and the solution is somewhat related to setting the Quota which ......
Discussions
Time Machine issue on 11.3
Since updating from 11.2 to 11.3 my mac (latest Catalina release) isn't able to backup to the time machine share anymore. The backup dialogue shows the following error: "the network backup disk does not support the required capabilities". I've already tried several things like deleting and... More on truenas.com
🌐 truenas.com
53
February 3, 2020
MacOS Monterey Time Machine dataset configuration problem
Newly arrived TrueNAS MiniX is having disagreements with MacOS Monterey Time Machine. The new Time Machine dataset is an SMB share owned by with group with rwx permissions down the tree. Mac OS happily mounts the volume and will let create directories and files from the Mac but Time Machine... More on truenas.com
🌐 truenas.com
5
February 16, 2022
SMB and Time Machine
I'm having the same problem on 12.0-U8 (not 8.1) since 20 May. I can't recall having changed anything on the system (haven't even rebooted it; it's been up 43 days). I did restart a network switch on 20 May (the one in the server rack with my NAS), but I'm otherwise communicating fine with the... More on truenas.com
🌐 truenas.com
11
June 6, 2022
TimeMachine not working no matter what I do
Hey there. I am on 21.08 Beta.1 I just bought a new mac for my wife and trying to setup TM. - Credentials -> Local Groups -> add new group named "timemachine", permit Sudo [x]; Samba... More on truenas.com
🌐 truenas.com
31
October 4, 2021
🌐
Reddit
reddit.com › r/truenas › psa: if upgrading to truenas 13 breaks your time machine backup
r/truenas on Reddit: PSA: If upgrading to TrueNAS 13 breaks your Time Machine backup
May 11, 2022 -

TLDR: 13 keeps forcing 1TB quota on Time Machine share. As a workaround - remove the quota, prevent it from getting set.

If you upgraded to 13 and suddenly Time Machine refuses to backup with "The selected network backup disk does not support the required capabilities - please choose a different network backup disk", read on.

The problem is that for some inconceivable reason the update sets 1TB quota on Time Machine dataset, and in the share options, on every boot. If you mount the Time Machine share manually in Finder, and press Command+I you'll see 0 bytes available. The error message macOS shows is highly misleading as it seems to imply SMB configuration is wrong, and it did send me to the wrong rabbit hole initially. There is nothing wrong with the SMB features, just the quotas.

To fix:

  1. login to SSH and run sudo testparm -s. Look for quota in Time Machine share settings. In TrueNAS 13.release the parameter is called zfs_core:base_user_quota and it got set to 1T on my instance. See if it anything but 0 or whatever else you may have set manually.

  2. Go to the Storage -> Pool -> Time Machine dataset -> Your user's child dataset -> ... -> User Quotas, you'll see 1TB limit there. Edit the quota, set the correct one (or zero) and save.

  3. Go to Sharing -> Windows Share -> Time machine Share -> Edit -> Advanced Options, Auxiliary Parameters add "zfs_core:base_user_quota = 0". Because this shit reappears in the share configuration as seen my testparm on every boot (dangit!).

Epilogue. 13.release seems rushed. heck, even ssh login banner cannot print the FreeBSD version, WTF?!

I recommend reverting back to 12 for the time being, at least until 13 is offered via autoupdate or reaches U milestone.

  1. Go to System -> Boot -> 12.0 -> ... -> Activate.

  2. Reboot

  3. But WTF -- Time machine is broken here too now!

  4. To fix it, confirm the quota did not get set on user's time machine dataset, and check with testparm -s which setting got applied. Im my case it was "ixnas:default_user_quota = 1T". I've added ixnas:default_user_quota = 0 in the Advanced Options on the share and that was that.

Moral of the story. Don't install raw software which even vendor themselves don't offer for autoupdate. Nobody to blame here but myself.

Top answer
1 of 2
6
Thanks for the heads up, going to stay on 12 for a while until issues like these are fixed.
2 of 2
2
Have you logged this as a bug?
🌐
TrueNAS Community
truenas.com › forums › archives › freenas (legacy software releases) › freenas help & support › sharing
Time Machine issue on 11.3 | TrueNAS Community
February 3, 2020 - Last week I updated my FreeNAS server to 11.3 and my TM Backups still were working without any problems. Yesterday I decided to do a clean install of macOS Catalina on my Macbook. After that the problems started: I can still select the FreeNAS SMB share in the TM settings but when the backup starts there is an error which tells me that the "backup volume does not support the necessary functionality" (translated from german...).
🌐
TrueNAS Community
truenas.com › forums › archives › general help › installation
MacOS Monterey Time Machine dataset configuration problem | TrueNAS Community
February 16, 2022 - The new Time Machine dataset is an SMB share owned by <user> with group <user> with rwx permissions down the tree. Mac OS happily mounts the volume and will let <user> create directories and files from the Mac but Time Machine gives the volume a poke and exits with message The selected network backup disk does not support the required capabilities.
🌐
TrueNAS Community
truenas.com › forums › archives › general help › operation and performance
SMB and Time Machine | TrueNAS Community
June 6, 2022 - Time Machine can't connect to the backup disk The operation couldn’t be completed. (OSStatus error -1073741275.) Click to expand... If I add a samba user with password or samba group I get · The selected network backup disk does not support the required capabilities.
🌐
TrueNAS Community
truenas.com › forums › truenas scale
TimeMachine not working no matter what I do | TrueNAS Community
October 4, 2021 - - Select disk ("backups" on pengo.local) - Enter user: wife + password - NO COMPLAINTS! (used to say: selected network backup disk does not support the required capabilities - please choose a different network backup disk) - initial backup to start in 120 seconds.
🌐
MacRumors
forums.macrumors.com › macs › macos › macos ventura (13)
Time Machine problems and questions | MacRumors Forums
March 24, 2023 - I have found that deleting (removing) a backup disk and re-attaching it didn't cause any issues. I suffered no loss of data. Time Machine recognized the disk as one of its backups and happily started using it again.
🌐
TrueNAS Community
truenas.com › forums › truenas scale
TimeMachine not working no matter what I do | Page 2 | TrueNAS Community
January 1, 2022 - If I then stop that backup, disable guest access, and unmount the disk, I can initiate a new backup, and data gets copied! This is awesome, except I really don't want to have to turn on guest access to begin backing up every machine. So what is it about guest access and bundle creation? ... Oh, this is too weird. With guest access off, I rebooted the NAS and went to a different mac, selected the time machine share, and started backing up with no problems.
Find elsewhere
🌐
TrueNAS Community
truenas.com › forums › truenas core
Updating to 13 (from 12U8) forces 1TB quota on Time Machine share | TrueNAS Community
May 12, 2022 - Namely, 1. 1TB quota being added ... message "The selected network backup disk does not support the required capabilities - please choose a different network backup disk"....
🌐
TrueNAS Community
truenas.com › forums › archives › general help › operation and performance
Multi-user Time Machine purpose | TrueNAS Community
February 23, 2022 - - In step 4, I had to change the permissions for "group@" to Full Control from Modify when using the RESTRICTED template. Without these changes, my Macs (tested on Big Sur and Monterey) were not able to connect to the Time Machine disk in step 7. The error returned was "Time Machine can't connect to the backup disk.
🌐
TrueNAS Community
truenas.com › forums › archives › general help › general
New Time Machine error since upgrading to TrueNAS-12.0-RC1 | TrueNAS Community
October 30, 2020 - I don't know if transferrable, I deleted the share, set up an identical one but selected multi user time machine. That worked for me. (And on the Mac, remove the TM destination then add the same one again.) All a bit mystical but functioning ... TrueNAS 13 Release Supermicro X11SSL-F Xeon E3-1220 v6 @ 3.00GHz 32Gb ECC RAM, 64Gb Boot SSD. 4*3Tb Red RaidZ2 plus solo 4Tb as TM Backup location via 9211 PCIe SAS card
🌐
TrueNAS Community
truenas.com › forums › truenas core
TimeMachine broken since update from TrueNAS Core 12 -> 13 | TrueNAS Community
July 4, 2022 - Hello, yesterday I updated from TrueNAS Core 13.0-RELEASE (from 12) and since then my mac can no longer start any TimeMachine Backups. If I try to (re) add the drive the mac tells me The selected network backup disk does not support the required capabilities. Please choose a different...
🌐
TrueNAS Community
truenas.com › forums › truenas core
Disk Not Ejected Properly error with Time Machine backup | TrueNAS Community
March 3, 2023 - Time Machine backups fail with error "The selected network backup disk does not support the required capabilities."
🌐
TrueNAS Community
forums.truenas.com › truenas general
Time Machine problem with TrueNAS-Fangtooth-RC - TrueNAS General - TrueNAS Community Forums
March 20, 2025 - Is it just me or did Time Machine backups stop working with TrueNAS-Fangtooth-RC? Things are working fine before the update but now I get The selected network backup disk does not support the required capabilities. Wha…
🌐
Reddit
reddit.com › r/ubiquiti › unas pro time machine problem - "the network backup disk does not support the required capabilities"
r/Ubiquiti on Reddit: UNAS Pro Time Machine problem - "The network backup disk does not support the required capabilities"
April 21, 2025 -

Hi,

I've been happily backing up my Mac to my UNAS Pro for a few weeks now, but suddenly it's started failing with and error in MacOS saying

"The network backup disk does not support the required capabilities"

Google searched for this don't seem to give me any UNAS Pro results but a load of stuff from Synology when an update gave the same error.

Has anyone encountered this? Using MacOS 15.4, UniFi OS 4.1.22 and Drive 1.19.1.

Can't pin down exactly when it failed as have been away for two weeks with my Mac off but my network kit still up so my UNAS might have updated. It worked before we went away but not now.

Top answer
1 of 5
2
It appears to be a "feature" of a UNAS Pro update. It will now only allow you to backup to your Personal-Drive. I ran into the same issue when I updated to the latest UNAS firmware. I'm trying to see if maybe if it is a permissions issue. I updated permissions on a new Shared Folder on the UNAS to match the Personal-Drive perms. I just need to reboot the UNAS to see if the new Share can be recognized as a valid drive for Time Machine use.... 🤞🍀
2 of 5
1
Hello! Thanks for posting on r/Ubiquiti ! This subreddit is here to provide unofficial technical support to people who use or want to dive into the world of Ubiquiti products. If you haven’t already been descriptive in your post, please take the time to edit it and add as many useful details as you can. Ubiquiti makes a great tool to help with figuring out where to place your access points and other network design questions located at: https://design.ui.com If you see people spreading misinformation or violating the "don't be an asshole" general rule, please report it! I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns.
🌐
NETGEAR Communities
community.netgear.com › netgear communities › welcome to the netgear community › enterprise solutions › readynas › use your readynas
Time Machine "selected backup disk does not support the required capabilities" | NETGEAR Communities
January 6, 2019 - Time machine backups from my iMac Pro to my ReadyNAS204 began failing shortly after updating my iMac Pro to 10.14.2. I've tried resetting the time machine settings on my ReadyNAS; however, now when I select the new disk from the iMac's Time Machine preferences panel I get an alert box with contents "The selected network backup disk does not support the required capabilities."
🌐
TrueNAS Community
forums.truenas.com › truenas general
TimeMachine breaks on Fangtooth moving from Beta to RC - TrueNAS General - TrueNAS Community Forums
April 2, 2025 - When moving from Fangtooth Beta to RC, I lost the ability to use timemachine for backups. I can see the SMB mount for time machine, but my mac spits out “The selected network backup disk does not support the required capabilities.” If I rebooting back to the beta and timemachine works again.
🌐
Apple Community
discussions.apple.com › thread › 254791807
Networked Time Machine backup can't be cr… - Apple Community
April 15, 2023 - However, when attempting to perform a Time Machine backup, I receive the error: “The backup disk could not be found. Make sure the backup disk is connected or select a different backup disk.” If I bypass Google WiFi and connect my MacBook directly to the common router (where the NAS is ...
🌐
TrueNAS Community
truenas.com › forums › truenas core
How to create Time Machine share? | TrueNAS Community
July 20, 2022 - Time Machine backups fail with error "The selected network backup disk does not support the required capabilities."