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MacBook Pro backup is taking a LONG time (15 hours or more)

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Greetings - I have 2 identical 2017 MacBook Pros. 500GB SSDs, 16GB RAM, running High Sierra (a little old). They both have roughly the same amount of data (250GB). Acronis True Image 2020 is installed on both of them. I am using a single USB 3.0 external backup drive to backup both of them, one at a time.

On the 1st laptop I plug the backup drive into a USB port and a full backup takes 1 hour 5 minutes. On the 2nd laptop I plug the backup drive into a USB port and a full backup takes OVER 15 HOURS. I don't even trust it. I tried both USB ports on the 2nd laptop.

My first thought was that something has to be wrong with the SSD on the 2nd laptop. BUT I have run several disk checkers on it and it checks out perfect w/no issues. Same OS, same ATI install, etc. I am at a loss to explain this.

Does anyone have any ideas why the 2nd laptop backup is taking so much longer to backup ???

Thanks in advance - Mark

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Hello Mark,

thank you for your posting!  

First of all, please test the connection speed by transferring a big chunk of data to the same destination and see what the speed difference is between a normal transfer and the backup. Try restarting your Mac - does it make any difference?  I'd also suggest checking the drive for errors with Disk Utility. 

In each case the reason for the performance issues can be different, so please contact our Support Team that will help to pin down the possible cause.