Time Machine Back Up External AND Internal Drives

Time Machine backed up my external hard drive just fine, but it didn't back up the internal hard drive in my Desktop Pro. That disc was not listed as an exclusion. How to I get TM to back up both?

Current Pro Desktops

Posted on Jan 26, 2022 7:57 AM

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11 replies

Jan 27, 2022 7:39 PM in response to MrJimsCommunity

The way it is supposed to work is that it backs up all the Mac-formatted drives attached to your Mac when there backup begins.


It will not backup drives in other, non-Mac formats, or drives actually controlled by third-party formatters that are actually Windows New Technology File System (NTFS) drives, that simulate a MacOS volume inside a NTFS file.


if you have checked all your drive formats or have a habit of using disk Utility to format EVERY new drive, by its immutable hardware device name, then this behavior is unexplained.

Jan 28, 2022 6:51 AM in response to MrJimsCommunity

...then you should go to the Fundamental source:


Get Support


Be polite and professional. If the first responder in not helping, ask to be forwarded to a specialist. Specialists can be more knowledgeable, but are FAR less patient.


Do not let them off the hook unless/until you have them actually solve your problem or someone has filed a Bug Report.

Jan 27, 2022 10:20 PM in response to MrJimsCommunity

MrJimsCommunity Said:

"Time Machine Back Up External AND Internal Drives: Time Machine backed up my external hard drive just fine, but it didn't back up the internal hard drive in my Desktop Pro. That disc was not listed as an exclusion. How to I get TM to back up both?"

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Partiton this:

Create a partition (use Disk Utility), and then use that partition for the other drive. See if that works. Elsewise, try another external drive, seeing if it works.

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Time Machine Back Up External AND Internal Drives

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