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From: TaliesinSoft on 17 May 2010 13:17
The Time Machine documentation found at
<http://www.apple.com/macosx/what-is-macosx/time-machine.html> states
that "Time Machine saves the hourly backups for the past 24 hours,
daily backups for the past month, and weekly backups for everything
older than a month." Just before posting this a check showed that there
was an available backup "Yesterday at 12:00 PM" and that the most
recent backup was "Today at 12:00 PM". Between these two are 23 more
backups, each on the hour, 1:00 PM, 2:00 PM, 3:00 PM, and so on,
meaning that the most recent 25 hours of backups are saved. This
pattern of there being 25 most recent hourly backups is always true. I
am using TimeMachineEditor to schedule the backups to occur each hour
on the hour. So is the fact that there are 25 most recent hours instead
of 24 because of TimeMachineEditor or is it a mistake in Apple's
documentation?


--
James Leo Ryan
Austin, Texas

From: Tom Harrington on 17 May 2010 13:49
In article <85dc19Fmj2U3(a)mid.individual.net>,
TaliesinSoft <taliesinsoft(a)me.com> wrote:

> The Time Machine documentation found at
> <http://www.apple.com/macosx/what-is-macosx/time-machine.html> states
> that "Time Machine saves the hourly backups for the past 24 hours,
> daily backups for the past month, and weekly backups for everything
> older than a month." Just before posting this a check showed that there
> was an available backup "Yesterday at 12:00 PM" and that the most
> recent backup was "Today at 12:00 PM". Between these two are 23 more
> backups, each on the hour, 1:00 PM, 2:00 PM, 3:00 PM, and so on,
> meaning that the most recent 25 hours of backups are saved. This
> pattern of there being 25 most recent hourly backups is always true. I
> am using TimeMachineEditor to schedule the backups to occur each hour
> on the hour. So is the fact that there are 25 most recent hours instead
> of 24 because of TimeMachineEditor or is it a mistake in Apple's
> documentation?

From that description, "Yesterday at 12:00PM" sounds an awful lot like
"one day ago".

--
Tom "Tom" Harrington
Independent Mac OS X developer since 2002
http://www.atomicbird.com/
From: TaliesinSoft on 17 May 2010 17:15
On 2010-05-17 12:53:14 -0500, Lewis said:

> In message <85dc19Fmj2U3(a)mid.individual.net> TaliesinSoft
> <taliesinsoft(a)me.com> wrote:
>> The Time Machine documentation found at
>> <http://www.apple.com/macosx/what-is-macosx/time-machine.html> states
>> that "Time Machine saves the hourly backups for the past 24 hours,
>> daily backups for the past month, and weekly backups for everything
>> older than a month." Just before posting this a check showed that there
>> was an available backup "Yesterday at 12:00 PM" and that the most
>> recent backup was "Today at 12:00 PM". Between these two are 23 more
>> backups, each on the hour, 1:00 PM, 2:00 PM, 3:00 PM, and so on,
>> meaning that the most recent 25 hours of backups are saved. This
>> pattern of there being 25 most recent hourly backups is always true. I
>> am using TimeMachineEditor to schedule the backups to occur each hour
>> on the hour. So is the fact that there are 25 most recent hours instead
>> of 24 because of TimeMachineEditor or is it a mistake in Apple's
>> documentation?
>
> Neither. Apple's documentation is correct. It takes 25 backups to cover
> 24 hours completely, since you will have (as you saw) a backup at 12pm
> yesterday and one at 12pm today. 25 backups for 24 hours.

But that first backup, the one at 12 PM yesterday, covered the changes
made since 11 AM yesterday, thus, as I see it, what I always will have,
if I have remained connected, are the last 25 consecutive hours of
backups.

--
James Leo Ryan
Austin, Texas

From: Tom Stiller on 17 May 2010 17:32
In article <85dpusFg6lU1(a)mid.individual.net>,
TaliesinSoft <taliesinsoft(a)me.com> wrote:

> On 2010-05-17 12:53:14 -0500, Lewis said:
>
> > In message <85dc19Fmj2U3(a)mid.individual.net> TaliesinSoft
> > <taliesinsoft(a)me.com> wrote:
> >> The Time Machine documentation found at
> >> <http://www.apple.com/macosx/what-is-macosx/time-machine.html> states
> >> that "Time Machine saves the hourly backups for the past 24 hours,
> >> daily backups for the past month, and weekly backups for everything
> >> older than a month." Just before posting this a check showed that there
> >> was an available backup "Yesterday at 12:00 PM" and that the most
> >> recent backup was "Today at 12:00 PM". Between these two are 23 more
> >> backups, each on the hour, 1:00 PM, 2:00 PM, 3:00 PM, and so on,
> >> meaning that the most recent 25 hours of backups are saved. This
> >> pattern of there being 25 most recent hourly backups is always true. I
> >> am using TimeMachineEditor to schedule the backups to occur each hour
> >> on the hour. So is the fact that there are 25 most recent hours instead
> >> of 24 because of TimeMachineEditor or is it a mistake in Apple's
> >> documentation?
> >
> > Neither. Apple's documentation is correct. It takes 25 backups to cover
> > 24 hours completely, since you will have (as you saw) a backup at 12pm
> > yesterday and one at 12pm today. 25 backups for 24 hours.
>
> But that first backup, the one at 12 PM yesterday, covered the changes
> made since 11 AM yesterday, thus, as I see it, what I always will have,
> if I have remained connected, are the last 25 consecutive hours of
> backups.

But you have tampered with Time Machine's normal schedule by forcing it
to backup exactly on the hour thereby introducing a "fencepost"
situation (and letting Apple off the hook).

--
Tom Stiller

PGP fingerprint = 5108 DDB2 9761 EDE5 E7E3 7BDA 71ED 6496 99C0 C7CF
From: Joseph Capgras on 17 May 2010 18:31
TaliesinSoft wrote:
> The Time Machine documentation found at
> <http://www.apple.com/macosx/what-is-macosx/time-machine.html> states
> that "Time Machine saves the hourly backups for the past 24 hours, daily
> backups for the past month, and weekly backups for everything older than
> a month." Just before posting this a check showed that there was an
> available backup "Yesterday at 12:00 PM" and that the most recent backup
> was "Today at 12:00 PM". Between these two are 23 more backups, each on
> the hour, 1:00 PM, 2:00 PM, 3:00 PM, and so on, meaning that the most
> recent 25 hours of backups are saved. This pattern of there being 25
> most recent hourly backups is always true. I am using TimeMachineEditor
> to schedule the backups to occur each hour on the hour. So is the fact
> that there are 25 most recent hours instead of 24 because of
> TimeMachineEditor or is it a mistake in Apple's documentation?
>
>

Jimbo, better tell your doc to up your OCD meds...
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