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Time Machine Oddity

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  Time Machine Oddity TaliesinSoft <taliesinsoft@me.com> - 2015-01-26 14:42 -0600
    Re: Time Machine Oddity Barry Margolin <barmar@alum.mit.edu> - 2015-01-26 17:07 -0500
    Re: Time Machine Oddity Tom Stiller <clusterfux.upmon@gmail.com> - 2015-01-27 03:00 +0000
      Re: Time Machine Oddity TaliesinSoft <taliesinsoft@me.com> - 2015-01-26 21:22 -0600

#69041 — Time Machine Oddity

I have Time Machine configured to backup to two different disk drives. 
It is my understanding that this will alternate the hourly backups to 
the two drives. If I open Time Machine preferences it does indeed show 
that the most recent backups to the two drives are an hour apart. 
However when I enter Time Machine the tabs on the righthand edge of the 
screen have two for each hourly backup, one for each of the backup 
drives. Are two concurrent backups actually happening or is this a 
mistaken display on the part of Time Machine?

-- 
James Leo Ryan - Austin, Texas

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#69043

In article <cinn6aFttvmU1@mid.individual.net>,
 TaliesinSoft <taliesinsoft@me.com> wrote:

> I have Time Machine configured to backup to two different disk drives. 
> It is my understanding that this will alternate the hourly backups to 
> the two drives. If I open Time Machine preferences it does indeed show 
> that the most recent backups to the two drives are an hour apart. 
> However when I enter Time Machine the tabs on the righthand edge of the 
> screen have two for each hourly backup, one for each of the backup 
> drives. Are two concurrent backups actually happening or is this a 
> mistaken display on the part of Time Machine?

Look at the timestamps of some recently modified files in the two sets 
of backups. My guess is that every other backup on the two drives will 
not show any changes.

-- 
Barry Margolin, barmar@alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***

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#69077

On 2015-01-26, TaliesinSoft <taliesinsoft@me.com> wrote:
> I have Time Machine configured to backup to two different disk drives.
> It is my understanding that this will alternate the hourly backups to
> the two drives. If I open Time Machine preferences it does indeed show
> that the most recent backups to the two drives are an hour apart.
> However when I enter Time Machine the tabs on the righthand edge of the
> screen have two for each hourly backup, one for each of the backup
> drives. Are two concurrent backups actually happening or is this a
> mistaken display on the part of Time Machine?
>
I also have Time Machine configured to use two [network attached]
backup devices. I allow the TM to produce backups at its own pace,
not forced to a rigid schedule by some third party app. The tabs on the
right of the TM screen show the correct times, properly interspersed
as one would expect.

If one of my devices is slower than the other (another computer
backing up to it) the tabs on the right of the TM screen are magenta
for the faster responding device and the other stay white until the
second device responds.

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#69085

On 2015-01-27 03:00:59 +0000, Tom Stiller said:

> On 2015-01-26, TaliesinSoft <taliesinsoft@me.com> wrote:
>> I have Time Machine configured to backup to two different disk drives.
>> It is my understanding that this will alternate the hourly backups to
>> the two drives. If I open Time Machine preferences it does indeed show
>> that the most recent backups to the two drives are an hour apart.
>> However when I enter Time Machine the tabs on the righthand edge of the
>> screen have two for each hourly backup, one for each of the backup
>> drives. Are two concurrent backups actually happening or is this a
>> mistaken display on the part of Time Machine?
>> 
> I also have Time Machine configured to use two [network attached]
> backup devices. I allow the TM to produce backups at its own pace,
> not forced to a rigid schedule by some third party app. The tabs on the
> right of the TM screen show the correct times, properly interspersed
> as one would expect.
> 
> If one of my devices is slower than the other (another computer
> backing up to it) the tabs on the right of the TM screen are magenta
> for the faster responding device and the other stay white until the
> second device responds.

The two drives used for the Time Machine backups are both hardware 
identical and are both locally connected. The timing of the backups are 
completely controlled by Time Machine itself.

But now things get even stranger as only one backup an hour was 
reported for part of the day and two backups an hour for the remainder 
of the day.

-- 
James Leo Ryan - Austin, Texas

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