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Synology Community
community.synology.com › enu › forum › 1 › post › 138467
Time Machine on Mac OS Big Sur
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Synology Knowledge Center
kb.synology.com › en-br › DSM › tutorial › Time_Machine_insufficient_space_error
My Time Machine backup failed due to insufficient space. What can I do? - Synology Knowledge Center
May 11, 2026 - Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.
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Apple Community
discussions.apple.com › thread › 252047233
time machine big sur - Apple Community
November 15, 2020 - Time machine back up problem For some months I have used Time machine to back up my mac. the last time was yesterday I backed up through it. But today when I connect the external HDD for backup, time machine says(Screenshot). I have no idea....
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SynoForum
synoforum.com › forums › file sharing
When trying a backup, the NAS folder shows 0 bytes available - can't figure out why | SynoForum.com - The Unofficial Synology Forum
January 19, 2023 - I have a 920 setup with webdav. I am trying out Arq and CCC. When trying to backup, it says the destination drive folder has 0kb free and fails. I cannot figure out why - permissions seems set ok and no restrictions. Any suggestions? Thanks!
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Synology Community
community.synology.com › enu › forum › 1 › post › 131975
Time Machine out of space - confused about Time Machine size and Synology quota | Synology Community
My Time Machine backups have started to fail for lack of space. From the menubar my MacBook, Time Machine lists itself as being 10.78TB, which I assume is not the case. When I launch Time Machine on my MacBook, I can only see a single backup (from yesterday).
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Reddit
reddit.com › r/synology › time machine - "there isn't enough space"
r/synology on Reddit: Time Machine - "There isn't enough space"
December 21, 2021 -

Hey everyone,

I'm getting an error about space available. The NAS itself still has some 4TB's available. The share where I have Time Machine backing into is set with a quota of 1TB and has 953.5GB's available.

Usually with Time Machine, it's supposed to automatically cleanup and delete old backups in order to make room for newer ones.

Having said that, anyone know what's up or where this is coming from? I'm not sure what's causing this to the point where it can't delete files, unless it's not deleting them.

Anyone seen this before and knows what's up?

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Synology Knowledge Center
kb.synology.com › en-br › DSM › tutorial › Time_Machine_backup_failed
Time Machine backup failed. What should I do? - Synology Knowledge Center
Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.
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Synology
kb.synology.com › en-us › DSM › tutorial › What_should_I_do_to_fix_the_problem_when_connecting_to_Synology_NAS_using_Time_Machine
What should I do to fix the problem when connecting to Synology NAS using Time Machine? - Synology Knowledge Center
September 22, 2021 - Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.
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Synology Community
community.synology.com › enu › forum › 1 › post › 163366
Time Machine stuck
October 16, 2023 - Hi! Come and join us at Synology Community. A place to answer all your Synology questions. Ask a question or start a discussion now.
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Reddit
reddit.com › r/synology › time machine "out of space"
r/synology on Reddit: Time Machine "Out of space"
July 3, 2024 -

First, I want to mention that I found and read this older post:
https://www.reddit.com/r/synology/comments/rlmzri/time_machine_there_isnt_enough_space/

My Time Machine on my Macbook Pro alerted me a couple of weeks ago that it was out of room. I didn't really get why, since (as everyone mentions) it's supposed to erase old data to make room for new data. In any case, I have increased the Shared Folder Quota on my NAS from 3TB to 5TB. (My new internal SSD is 2TB, of which I'm currently using 1.33TB of space.)

Current Shared Folder Size is 2.85TB. The Recycle Bin has never been turned on. It's all been working well for over a year, even through the purchase of my new computer about 6 months ago. The only hiccups are recent.

Now the volume (which I can still see on the NAS) is no longer visible to Time Machine and doesn't appear or mount in my Finder. (Not sure it did before, but Time Machine was certainly able to see it.) I've attached a few screenshots here that may help clarify what's up.

In the Time Machine app, when I try to look at restoring older files, the earliest backup seems to be June 19, 2024 (today is July 3, 2024), so something did back up, but the older backups seem to be inaccessible now.

Have I hit some sort of size limitation? Is there a setting to check? Do I need to start over with Time Machine?

Deeply appreciate any knowledgeable advice. Thanks.

(P.S. I'm kind of a NAS newbie, but an experienced Mac user, if that helps you frame your answers.)

I can see the volume in Finder but it won't mount. The error message from Time Machine No backups since June 19, 2024 What I see in QuickConnect This is what I get when I double click on the volume in Finder.
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The Eclectic Light Company
eclecticlight.co › 2021 › 12 › 28 › a-strategy-for-tackling-nas-problems
A strategy for tackling NAS problems – The Eclectic Light Company
December 28, 2021 - GREAT piece Howard on NAS strategies. I see from your screenshots that you are using Synology hardware, as am I. I normally, intentionally, do not incorporate my NAS in the Time Machine (TM) process, either as a primary storage location, or in any kind of rotation.
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Synology Community
community.synology.com › enu › forum › 1 › post › 126732
New Time Machine Backup Failed For Space
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Synology Community
community.synology.com › enu › forum › 1 › post › 135909
Time Machine (MacOS 10.15.6) shows wrong disk size and ...
July 30, 2020 - Hi! Come and join us at Synology Community. A place to answer all your Synology questions. Ask a question or start a discussion now.
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Synology Community
community.synology.com › enu › forum › 1 › post › 125538
Apple Time Machine saying there's not enough space on ...
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Synology
kb.synology.com › en-us › DSM › tutorial › How_can_I_limit_space_taken_up_by_Time_Machine_backup
How can I limit the amount of space taken up by Time Machine backup data? - Synology Knowledge Center
Synology Knowledge Center offers comprehensive support, providing answers to frequently asked questions, troubleshooting steps, software tutorials, and all the technical documentation you may need.
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Synology
forum.synology.com › enu › viewtopic.php
KB Tutorial for Time Machine setup inaccurate! - Synology Forum
June 15, 2017 - i've discovered this to be true as well. doing initial setup of 916+ and the KB plus manual are wrong. if anyone has a proper updated guide for DSM 6.1 please share! ... I would like that manual as well. It really should not be that hard... I have a brand new DS716+II which so far I have been very impressive. But I cannot get my MacBook Pro to Time Machine backup to it.
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MacRumors
forums.macrumors.com › macs › networking
Using a NAS for TimeMachine? | MacRumors Forums
December 28, 2021 - Hi all, I've been meaning to get a home NAS for ages, and gather many of the normal brands allow using NAS for TimeMachine backups - which I don't currently have set up at all and have never used but it seems a great idea to use it if it's available. One warning I've seen is that TM will...
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Synology Community
community.synology.com › enu › forum › 1 › post › 151833
Synology Community
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Synology Community
community.synology.com › enu › forum › 1 › post › 124151
Time Machine Backup doesn't work
March 9, 2019 - Hi! Come and join us at Synology Community. A place to answer all your Synology questions. Ask a question or start a discussion now.