Should I unplug external drives during the upgrade?

Contemplating upgrading to El Capitan.  I have an iMac end of 2014, so I know that it is correct.  My question is - should I disconnect all external drives and devices before you run the upgrade, or it doesn't matter?


I remember too, when I updated before, the new operating system does recognize the Time Machine backups.  Should I do to be able to access the TM of the previous operating system?

Thank you

Barbara

It can't hurt to unplug external drives.

Time Machine should recognize the previous backups. Which means, you should be able to go back to the backups made since previous versions of OS X. I know when I upgraded from 10.10.5 to 10.11.3, I could see/restore back ups in 10.10.5.

Another thing to consider is once the Installer OS X El Capitan.app file is downloaded and before you click continue to install, copy this file from / applications to another folder (for example, downloads) so that you have it if you need it in the future. Download time records.

Tags: Mac OS & System Software

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