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The back up disk is showing 2.81 TB of free space out of 4 TB, yet Time Machine says it is full.
I believe the back ups are using space on the Mac hard drive and thus preventing other activity as this is also now nearly full.
I do not have another empty drive Time Machine can use right now.
I am unable to use disk utility to diagnose and repair the back up disk as it fails, sying the disk is in use.
Predicated on the 4 TB drive is used exclusively for Time Machine Backup purposes and has Not Been Partitioned into more than one Drive
How to delete Time Machine snapshots on your Mac.
Often caused if the Time Machine Drive has not been attached to the computer and TM Backup is set to run on a Schedule.
TM Backup will make Snap Shot on the Internal Drive awaiting the TM Backup Drive to be attached.
Only then will the Snaps Shots be transferred to the External Drive and deleted the Internal Drive.
Predicated on the 4 TB drive is used exclusively for Time Machine Backup purposes and has Not Been Partitioned into more than one Drive
How to delete Time Machine snapshots on your Mac.
Often caused if the Time Machine Drive has not been attached to the computer and TM Backup is set to run on a Schedule.
TM Backup will make Snap Shot on the Internal Drive awaiting the TM Backup Drive to be attached.
Only then will the Snaps Shots be transferred to the External Drive and deleted the Internal Drive.
There is Purgeable Space and there is Empty Space.
Purgeable Space which is Controlled by the Operating System. When the Operating Systems decides the computer needs additional Empty Space, it will move a portion of the Purgeable to Empty space
AFAIK - there is no User Actions to hasten this transition from Purgeable to Empty Space
It can day or longer before this will occur
The links below will assist in identifying what is taking up space on the Internal Drive and provide possible ways to remove data that is under the direct control of the User ( Home Folder ) .
Rebuild the Spotlight index on your Mac
What is “Other” storage on a Mac, and how can I clean it out?
Free up storage space on your Mac
How to delete Time Machine snapshots on your Mac.
Often caused if the Time Machine Drive has not been attached to the computer and TM Backup is set to run on a Schedule.
TM Backup will make Snap Shot on the Internal Drive awaiting the TM Backup Drive to be attached.
Only then will the Snaps Shots be transferred to the External Drive and deleted the Internal Drive.
See used and available storage space on your Mac
Locate backups of your iPhone, iPad, and iPod touch
If you have many Adobe Applications installed, you have explore with Adobe on how to remove their cache files.
I have seen some users regain many GBs of space after the cache files have been removed.
FYI - these Adobe caches files will and so will any system cache files will be recreated as the System or Application requires them
Notation - If the user is using a cloning software like Carbon Copy Cloner - and https://bombich.com/kb/ccc6/automated-maintenance-ccc-safetynet-folder suggest tweaking the Safety Net Feature in this software. It may be making additional Snap Shots that are not being Cloned to the Eternal Drive. If this should be the case, these Snap Shot could be using additional space on the drive
The final word from Apple on Managing the " Other/ System Data “ Category
Other / System Data: Contains files that don’t fall into the categories listed here. This category primarily includes files and data used by the system, such as log files, caches, VM files, and other runtime system resources. Also included are temporary files, fonts, app support files, and plug-ins. You can't manage the contents of this category. The contents are managed by macOS, and the category varies in size depending on the current state of your Mac.
Thank you for your help.
It seems that Timemachine was trying to back up over 7TB of data - somehow it was trying to include a couple of large drives that were previously excluded from back up. Back ups are now continuing normally.
The problem I now have is that my hard drive is nearly full. There is 1.04 TB of 'other' taking up space. I do not feel confident in following your advice of the link in investigating and deleting unwanted files included in 'other' . There doesn't appear to be any sign that Timemachine is deleting any unwanted data.
Nick.
Welcome and thank you too.
Should additional assistance be needed, please post back in reply and we will see what more we can offer on this issue
Time Machine backup fails with no space on disk.
