This is somewhat by design. Time Machine assumes it owns whatever volume
you point it to and will continue to make incremental backups until the
volume is full. At that point it will begin to cull old backups. That's
why it's generally not a good idea to try and share space on a volume
with time machine. Some workarounds are to partition a volume to reign
in the amount of disk space TM can use. Another is to create a disk
image on that drive, mount that disk image and the point time machine
there. You can define how big the disk image is when you create it with
Disk Utility. TM won't recognize the disk image on its own. Not sure why
but you can manually do that in terminal by doing
tmutil setdestination /Volumes/Name_of_Your_Mounted_Disk_Image
Of course that means you must have that disk image opened before backups
will work and you should dismount that disk image before you disconnect
the external drive to make sure everything is buttoned up correctly.
Hope this helps.
CB
On 6/9/17 12:07 PM, jean parker wrote:
Hello All:
Apparently time machine is not deleting old backups. I have looked and can’t
find anything about this in preferences. How can I get rid of the old backups
which are now consuming space on my external hard drive? Can I send them to the
trash?
Many thanks,
Jean
Dr. Jean Parker, Ph.D.
Senior Research Fellow
Trans4m Center For Integral Development
Geneva, Switzerland
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¯\_(ツ)_/¯
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