A Bit Strange

User discussion and information resource forum for Image products.

A Bit Strange

Postby AlanD » Wed Jul 27, 2016 7:00 pm

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
AlanD
 
Posts: 198
Joined: Sat Sep 17, 2011 9:45 am

Re: A Bit Strange

Postby Brian K » Wed Jul 27, 2016 8:42 pm

Alan,

Does the backup run at exactly the same time every day?
Brian K
 
Posts: 1181
Joined: Thu Aug 11, 2011 6:11 pm

Re: A Bit Strange

Postby TAC109 » Wed Jul 27, 2016 9:13 pm

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


>



TAC109
 
Posts: 216
Joined: Tue Sep 06, 2011 3:41 pm

Re: A Bit Strange

Postby AlanD » Thu Jul 28, 2016 8:31 am

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
AlanD
 
Posts: 198
Joined: Sat Sep 17, 2011 9:45 am

Re: A Bit Strange

Postby AlanD » Thu Jul 28, 2016 8:33 am

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?
AlanD
 
Posts: 198
Joined: Sat Sep 17, 2011 9:45 am

Re: A Bit Strange

Postby Bob Coleman » Thu Jul 28, 2016 1:05 pm

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.
Bob Coleman
 
Posts: 407
Joined: Fri Aug 12, 2011 10:58 am

Re: A Bit Strange

Postby AlanD » Thu Jul 28, 2016 7:42 pm

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
AlanD
 
Posts: 198
Joined: Sat Sep 17, 2011 9:45 am


Return to Image for DOS/Linux/Windows