Retention Rules For 5 Week Cycle


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DarrenT
DarrenT
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We have been evaluation Macrium Reflect 6 and since purchased.
We are in the process of setting up the retention rules for our nightly backups (scheduled for 4 nights per week, Mon, Tue, Wed and Thu) but find the explanations a bit confusing and not a lot of worked retention rule examples close to what we need.
When up and running we want (via the retention rules) to give us 5 weeks of backups comprising (for each 4 day week) a full backup (F) and 3 days of differentials (D) i.e. Week 1 - FDDD, Week 2 - FDDD, Week 3 - FDDD, Week 4 - FDDD, Week 5 - FDDD. Once Week 6 starts to build (with a successful full backup), the Week 1 set is deleted.

Q. How do we setup the Full Keep and Differential Keep retention rules to achieve this pattern ?


Froggie
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Hi Darren!  To make more sense of what you're trying to do, you need to know that any DIFF image is a "child" of the FULL "parent."  Any INC image is a child of the most recent DIFF or FULL image.  Knowing this, when you delete a FULL image, all of its delendant children (DIFFs & INCs) have to disappear as well since their dependency is being deleted.

That stated, if you set your FULL up to a WEEKLY operation and pick the date/time you'd like it to start, day of the week to run and the EVERY = 1-week... you're in for a weekly FULL.  Then set up a DIFF for a WEEKLY operation as well, select the day(s) you want it to run (the ones other than the FULL), EVERY = 1-week and the date/time to start the schedule... you're in for daily DIFFs each week.

As far as RETENTION is concerned, all you need to manage is your FULLs as their children (the DIFFs) will disappear along with them (they have to).  To do that all you have to do is CHECK the FULL retention option and set it for KEEP = 5-weeks. Insure that the other retention rules (DIFF & INC) are unCHECKed.  To  make sure you get your 5th week before week 1 is deleted, in the main Scheduling window (not the events themselves)... make sure the Run the purge before backup option is unCHECKed (it's located in the lower left area of the window).

In the above schedule, you're managing your FULLs at a 5-week interval and deleting your 1st FULL (as well as all its DIFFs... the whole 5-week set will be deleted) as soon as your 6th FULL has been generated.

Hope this helps!
Edited 19 March 2017 12:48 PM by Froggie
Drac144
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Froggie,

I am confused about incremental backups.  You say that they are based on the last full OR differential backup.  Reading the knowledge base entry below I see two different statements that seem contradictory.

http://knowledgebase.macrium.com/display/KNOW7/Differential+and+incremental+disk+images

One says: "The main difference with incremental images is that they only store file system changes since the last image, either full, differential or incremental.

The other says: "they only store the changes that were made since the last full or incremental."

I thought the last one was true, but based on the above article and what you said, I am not sure. 


Froggie
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Drac144 - 19 March 2017 8:42 PM
One says: "The main difference with incremental images is that they only store file system changes since the last image, either full, differential or incremental.

This is the correct statement.  I was referring to Darren's possible use after reading his description.
DarrenT
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Hi Froggie,
Thank you for your explanation.
It is now clearer how having separate full and differential backup schedules combine with the retention rule to achieve the desired backup sets.
Our aim is to keep enough backup sets in place to be able to go back to a meaningful point in time if necessary while reducing storage space requirements.
We have since modified our schedules and retention rules and we will monitor the backup sets created to see if it all maps out.

GO

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