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A Bit Strange

PostPosted: Wed Jul 27, 2016 7:00 pm
by AlanD
I backup full drive every day, and use the /purge:-2 switch.
Strange part is, it saves images for two days about 2-3 days a week. On
other days, 3 backups are saved. I have never tried to investigate
further as to exactly when this happens.

It has always done this, ever since the 'purge' switch was added to IFW.

Any comments?

AlanD

Re: A Bit Strange

PostPosted: Wed Jul 27, 2016 8:42 pm
by Brian K
Alan,

Does the backup run at exactly the same time every day?

Re: A Bit Strange

PostPosted: Wed Jul 27, 2016 9:13 pm
by TAC109
Think of purge:-2 as giving your images a life of 48 hours or 2880 minutes.

AlanD wrote:
> I backup full drive every day, and use the /purge:-2 switch.
> Strange part is, it saves images for two days about 2-3 days a week. On
> other days, 3 backups are saved. I have never tried to investigate
> further as to exactly when this happens.
>
> It has always done this, ever since the 'purge' switch was added to IFW.
>
> Any comments?
>
> AlanD


>




Re: A Bit Strange

PostPosted: Thu Jul 28, 2016 8:31 am
by AlanD
On 2016-07-27 11:42 PM, Brian K wrote:
> Alan,
>
> Does the backup run at exactly the same time every day?
>
>
that would be the only difference, but AFAIK they all occur between 6
and 11 pm

I say this because my backups are manually instigated

Re: A Bit Strange

PostPosted: Thu Jul 28, 2016 8:33 am
by AlanD
On 2016-07-28 12:13 AM, Tom Cole wrote:
> Think of purge:-2 as giving your images a life of 48 hours or 2880 minutes.
>
> AlanD
>
> wrote:
>> I backup full drive every day, and use the /purge:-2 switch.
>> Strange part is, it saves images for two days about 2-3 days a week. On
>> other days, 3 backups are saved. I have never tried to investigate
>> further as to exactly when this happens.
>>
>> It has always done this, ever since the 'purge' switch was added to IFW.
>>
>> Any comments?
>>
>> AlanD
>
>
>>
>
>
Maybe I am thinking backwards but wouldn't that parameter mean that I
would sometimes have only one backup, as opposed to three?

Re: A Bit Strange

PostPosted: Thu Jul 28, 2016 1:05 pm
by Bob Coleman
AlanD wrote:
> On 2016-07-28 12:13 AM, Tom Cole wrote:
> > Think of purge:-2 as giving your images a life of 48 hours or 2880
> minutes.
> >
> > AlanD
> >
> > wrote:
> >> I backup full drive every day, and use the /purge:-2 switch.
> >> Strange part is, it saves images for two days about 2-3 days a week.
> On
> >> other days, 3 backups are saved. I have never tried to investigate
> >> further as to exactly when this happens.
> >>
> >> It has always done this, ever since the 'purge' switch was added to
> IFW.
> >>
> >> Any comments?
> >>
> >> AlanD
> >
> >
> >>
> >
> >
> Maybe I am thinking backwards but wouldn't that parameter mean that I
> would sometimes have only one backup, as opposed to three?

I have no familiarity with this option, but am just trying to apply logic to your last question.

You say all backups are done between 6 and 11 PM.

Let's say hypothetically that you do them consistently at 10 PM for a week. As I understand it that should get you in a routine where oldest of two is purged and the newly created backup joins the one not purged to maintain two.

Now suppose you do a backup at 7 PM. The way it looks to me the oldest existing backup created at 10 PM two days ago would not be 48 hours old and would not be purged.

Re: A Bit Strange

PostPosted: Thu Jul 28, 2016 7:42 pm
by AlanD
On 2016-07-28 4:05 PM, Bob Coleman wrote:
> AlanD wrote:
>> On 2016-07-28 12:13 AM, Tom Cole wrote:
>>> Think of purge:-2 as giving your images a life of 48 hours or 2880
>> minutes.
>>>
>>> AlanD
>>>
>>> wrote:
>>>> I backup full drive every day, and use the /purge:-2 switch.
>>>> Strange part is, it saves images for two days about 2-3 days a week.
>> On
>>>> other days, 3 backups are saved. I have never tried to investigate
>>>> further as to exactly when this happens.
>>>>
>>>> It has always done this, ever since the 'purge' switch was added to
>> IFW.
>>>>
>>>> Any comments?
>>>>
>>>> AlanD
>>>
>>>
>>>>
>>>
>>>
>> Maybe I am thinking backwards but wouldn't that parameter mean that I
>> would sometimes have only one backup, as opposed to three?
>
> I have no familiarity with this option, but am just trying to apply logic to your last question.
>
> You say all backups are done between 6 and 11 PM.
>
> Let's say hypothetically that you do them consistently at 10 PM for a week. As I understand it that should get you in a routine where oldest of two is purged and the newly created backup joins the one not purged to maintain two.
>
> Now suppose you do a backup at 7 PM. The way it looks to me the oldest existing backup created at 10 PM two days ago would not be 48 hours old and would not be purged.
>
>
Thanks, You are probably quite right in your thinking.

AlanD