Hi,

You are correct, about every hour or so.  See this Apple Support article for 
details.

https://support.apple.com/en-ca/HT204015 
<https://support.apple.com/en-ca/HT204015>

Later...

Tim Kilburn
Apple Teacher
(with Swift Playgrounds Recognition)
Fort McMurray, AB Canada

On Mar 19, 2019, at 12:56, 'E.T.' via MacVisionaries 
<macvisionaries@googlegroups.com> wrote:

  I will look at this and see. Do you know how often this takes place? Evey 
hour perhaps?

>From E.T.'s Keyboard...
  ancient.ali...@icloud.com
Many believe that we have been visited
in the past. What if it were true?

On 3/19/2019 8:49 AM, 'Tim Kilburn' via MacVisionaries wrote:
> Hi,
> Actually, it could still be TM.  TM does snapshots when there's no backup 
> drive connected.  So, in fact, you could recover a backup of sorts even when 
> your backup drive is not connected.  These snapshots make the actual transfer 
> of the backup to the drive quicker when it does happen, but can both use up 
> space and resources when the backup drive is not connected.  I don't believe 
> that it will show you when this is happening though, other than maybe in 
> Activity Monitor, but I'm not sure of that either.
> Later...
> Tim Kilburn
> Apple Teacher
> (with Swift Playgrounds Recognition)
> Fort McMurray, AB Canada
> On Mar 19, 2019, at 09:15, 'E.T.' via MacVisionaries 
> <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com>> 
> wrote:
>   I know its not TM because the backup drive is not connected.
> From E.T.'s Keyboard...
> ancient.ali...@icloud.com <mailto:ancient.ali...@icloud.com>
> Many believe that we have been visited
> in the past. What if it were true?
> On 3/19/2019 6:12 AM, 'Tim Kilburn' via MacVisionaries wrote:
>> Hi,
>> Next time it happens, check if Time Machine is carrying out any part of the 
>> backup process.
>> Later...
>> Tim Kilburn
>> Apple Teacher
>> (with Swift Playgrounds Recognition)
>> Fort McMurray, AB Canada
>> On Mar 18, 2019, at 12:18, 'E.T.' via MacVisionaries 
>> <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com> 
>> <mailto:macvisionaries@googlegroups.com>> wrote:
>>   Sometimes its a while before it happens, sometimes the very first VO 
>> command after startup causes this behavior. When the next macOS is released 
>> in the fall, I will monitor this before I install apps or make any changes. 
>> I do clean installs so it will be a fresh system.
>> From E.T.'s Keyboard...
>> ancient.ali...@icloud.com <mailto:ancient.ali...@icloud.com> 
>> <mailto:ancient.ali...@icloud.com>
>> Many believe that we have been visited
>> in the past. What if it were true?
>> On 3/18/2019 9:41 AM, 'Tim Kilburn' via MacVisionaries wrote:
>>> Hi,
>>> During the first day or so of a new installation, a lot of things are 
>>> happening in the background to optimize your disk such as indexing all data 
>>> on the drive, optimizing connections to Cloud services etc.  If this is 
>>> happening days later, then there really is something strange going on.
>>> Later...
>>> Tim Kilburn
>>> Apple Teacher
>>> (with Swift Playgrounds Recognition)
>>> Fort McMurray, AB Canada
>>> On Mar 18, 2019, at 09:48, 'E.T.' via MacVisionaries 
>>> <macvisionaries@googlegroups.com <mailto:macvisionaries@googlegroups.com> 
>>> <mailto:macvisionaries@googlegroups.com> 
>>> <mailto:macvisionaries@googlegroups.com>> wrote:
>>> Simon,
>>>   You and I are alone in this. What is going on?! (grins)
>>> From E.T.'s Keyboard...
>>> ancient.ali...@icloud.com <mailto:ancient.ali...@icloud.com> 
>>> <mailto:ancient.ali...@icloud.com> <mailto:ancient.ali...@icloud.com>
>>> Many believe that we have been visited
>>> in the past. What if it were true?
>>> On 3/18/2019 2:28 AM, Simon Fogarty wrote:
>>>> Hi ET,
>>>> I've just reimaged my mac book air,
>>>>  It's doing the same thing with the new installation of Mojave
>>>> And I can't figure it out.
>>>> There isn't anything specific that sets it off.
>>>> -----Original Message-----
>>>> From: 'E.T.' via MacVisionaries <macvisionaries@googlegroups.com 
>>>> <mailto:macvisionaries@googlegroups.com> 
>>>> <mailto:macvisionaries@googlegroups.com> 
>>>> <mailto:macvisionaries@googlegroups.com>>
>>>> Sent: Friday, 15 March 2019 4:16 AM
>>>> To: macvisionaries@googlegroups.com 
>>>> <mailto:macvisionaries@googlegroups.com> 
>>>> <mailto:macvisionaries@googlegroups.com> 
>>>> <mailto:macvisionaries@googlegroups.com>
>>>> Subject: Re: Optimizing SSD drive
>>>> Simon,
>>>>     I may have spoken too soon. Seems you and I are the only ones. It 
>>>> happened a lot in the Finder, but mostly when I run an app. It almost 
>>>> always happens, at random, when I press a VO command.
>>>>  From E.T.'s Keyboard...
>>>> ancient.ali...@icloud.com <mailto:ancient.ali...@icloud.com> 
>>>> <mailto:ancient.ali...@icloud.com> <mailto:ancient.ali...@icloud.com>
>>>> Many believe that we have been visited
>>>> in the past. What if it were true?
>>>> On 3/12/2019 10:59 PM, Simon Fogarty wrote:
>>>>> I don't think it's a specs issue,
>>>>> I was getting the same issue today on a mac book air that wasn't mine and 
>>>>> would have had lower than average specifications.
>>>>> 
>>>>> I also get it on an imac and my own mac books as well, I think along
>>>>> the lines that it's a voiceover issue
>>>>> 
>>>>> -----Original Message-----
>>>>> From: 'E.T.' via MacVisionaries <macvisionaries@googlegroups.com 
>>>>> <mailto:macvisionaries@googlegroups.com> 
>>>>> <mailto:macvisionaries@googlegroups.com> 
>>>>> <mailto:macvisionaries@googlegroups.com>>
>>>>> Sent: Tuesday, 12 March 2019 8:09 AM
>>>>> To: MacVisionaries <macvisionaries@googlegroups.com 
>>>>> <mailto:macvisionaries@googlegroups.com> 
>>>>> <mailto:macvisionaries@googlegroups.com> 
>>>>> <mailto:macvisionaries@googlegroups.com>>
>>>>> Subject: Optimizing SSD drive
>>>>> 
>>>>>      Some time ago I upgraded the 8gigs of ram to 16 on the MBP and 
>>>>> swapped the spinning drive for the SSD.
>>>>> 
>>>>>      I don't recall if the issue with Voiceover existed before then. What 
>>>>> happens is often when I am navigating the Mac, VO will sound like its 
>>>>> being throttled back then comes back quickly. Its random, I never know 
>>>>> when or what may trigger this.
>>>>> 
>>>>>      So I will have someone help me put the 8gigs back tomorrow and see 
>>>>> if the issue clears up. But I am wondering if the SSD is automatically 
>>>>> optimized or not. If not, can it be optimized?
>>>>> 
>>>>>      This happens even when I have done clean installs and have set 
>>>>> things up from scratch but I am willing to try anything to run this down. 
>>>>> Thoughts?
>>>>> 
>>>>>   From E.T.'s Keyboard...
>>>>> ancient.ali...@icloud.com <mailto:ancient.ali...@icloud.com> 
>>>>> <mailto:ancient.ali...@icloud.com> <mailto:ancient.ali...@icloud.com>
>>>>> Many believe that we have been visited in the past. What if it were
>>>>> true?
>>>>> 
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