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Very slow backup of 2015 MBP
Posted by: celliott
Date: February 07, 2019 06:12PM
Why does my MBC take so long to backup? I am using a 2.5” portable drive for the backup. I have a 2015 13” MBP with a 512GB Built in SSD. So far it has taken 2 hours and 45 min to backup 110GB of data using Carbon Copy Cloner and still another 50GB to go.

On the other hand, I backed up my wife’s 2012 MBP to another 2.5” drive. She has an internal 480GB SSD. I backed up almost 400GB of data in around 2 hours.

Why is the 2015 so much slower? Both running Mojave.
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Re: Very slow backup of 2015 MBP
Posted by: space-time
Date: February 07, 2019 06:16PM
check drive health on both machines. it is possible the source drive (internal) or the destination (external) may be failing.

for Hard drives and SSD, use SMART Utility

[www.volitans-software.com]

for SSD, you should also use DriveDx

[binaryfruit.com]

Both have free trials.

Also make sure CCC is up to date, and if necessary, delete and redo the backup script.

Run a malware scanner on the machine (Malwarebytes and etrecheck)

repair premissions, ZAP PRAM, run ONYX,


Hope one of these would help.
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Re: Very slow backup of 2015 MBP
Posted by: Golfer
Date: February 07, 2019 07:41PM
It more than likely has to due with the speed of the external drives and the enclosures they are in, not all enclosure boards are created equal. As a test, try backing up your drive to her enclosure and see if it goes faster.
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Re: Very slow backup of 2015 MBP
Posted by: space-time
Date: February 07, 2019 07:45PM
are both external drives USB 3.0? maybe one is 2.0?
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Re: Very slow backup of 2015 MBP
Posted by: celliott
Date: February 07, 2019 08:34PM
Thanks for the input. I’ll answer the parts I’m sure of at this point. Both externals are usb3. Could be the board in the enclosure, I’ll check it. It is a fresh script in CCC and I just updated the app before I started on both machines. I’ll try some of the other suggestions and see how it goes.
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Re: Very slow backup of 2015 MBP
Posted by: ka jowct
Date: February 07, 2019 09:29PM
I cloned a client’s drive recently. It took over 2 hours for about 100GB, but Etrecheck had indicated that her internal drive might be failing, and it was a 2011 MBP, so the backup drive was connected to USB 2.



My life goes smoothly and in regular intervals
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