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Time Machine won't backup: not enough space after erasing and formatting

Zhroonal

Zhroonal

macrumors newbie
Original poster
Dec 2, 2017
4
0
Today I wanted to use my Mac-only Toshiba external 1tb HDD for windows bootcamp as well. I used Disk Utility to erase and format the disk, I looked up instructions on how to make a partition: one for backups on High Sierra and one partition for storing data on High Sierra and Windows 10.
However, the disk would not backup on Time Machine as it says "Time Machine could not create a local snapshot to back up from because there was insufficient free space on the source volume(s)", even though I gave the "Backups" partition 200 GB of space.
I have searched for hours and nothing has helped so far so I really need some help as I need to get this problem resolved ASAP.


Many thanks,
Zhroon


PS. my MacBook Pro specs are:

dual core 2.7 GHz processor,

intel iris 6100 graphics,

8gb DDR3 memory,

128GB SSD running Mac OSX High Sierra

PS 2: this is my first time asking for help online so if I did anything wrong please tell me!
 
Have you excluded the other partition from the backup. Go to Time Machine then select Option at bottom right of screen. If the other partition is not included you could try allocating more space to Time Machine, say 500GB

Sorry just re-read your post. How much space do you have free on your main drive.
 
Hmm I would try it except for some reason Time machine just started backing up again
It may have been something to do with the system recognising the HDD has space as I started moving files into the storage partition of the disk.
Thank you for your help as I will use this if this problem pops up again.
 
No I don't think that could be it, because the External HDD hadn't been used after erasing all the content
[doublepost=1512232255][/doublepost]
dcmaccam said:
Have you excluded the other partition from the backup. Go to Time Machine then select Option at bottom right of screen. If the other partition is not included you could try allocating more space to Time Machine, say 500GB

Sorry just re-read your post. How much space do you have free on your main drive.
Click to expand...
Oh on my main drive I had about 3gb because I needed to put some files onto my Mac before erasing the EHDD
 
Sorry, I meant your main drive. Thats why you got the message about local snapshots. It was at that time it was trying to create a backup snapshot on your main drive (Source Volume) You shouldn't let your main drive get as low as 3GB.
 
Ok thanks for your help I'll try to maintain at least 20% of Storage at all times. Again I appreciate the help
 
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