Forum Discussion

RajaV's avatar
RajaV
Level 2
7 years ago

How Differential Backup takes Reference

Hi,

Please help to clear my doubt on below query.

1. We triggered a full backup manually  for a server 'ClientA' on Monday morning and it completed on thursday morning successfully (Policy name: Fileserver_ClientA).

2. We triggered differential incremental backup manually for the same  server 'ClientA' on Saturday morning and it got completed within 2 hours. (Policy name : Fileserver_ClientA).

3. But, in between a scheduled full backup started automatically on Friday and completed on Monday for the same server 'ClientA' (Policy name : NewServer_ClientA).

Now, my question is...

 

The differential backup which was triggered on saturday will consider the changes happened after the first full backup (point 1) or the recent full backup (point 3). Here the client name is same for both policies, but policy name differes.

Please provide your comments.

 

Thanks & Regards,

 

Raja V

 

 

 

 

 

 

 

7.7
windows server 2012
  • Genericus's avatar
    Genericus
    Moderator
    7 years ago

    The policy should have separate tracklogs.

    You also want to check the client - they can be set to use attribute or timestamp, although this option may not be universally available. Not sure if that will impact the differential.

     

     

     

  • PetrHanz's avatar
    PetrHanz
    Level 4
    7 years ago

    Hi RajaV

    Differential backup job can use change/tracklog to previous "finnished"  full backup or another differential/cumulative backup, only. Change/tracklog cannot be used against second full backup running. 

       

       

     

    • RajaV's avatar
      RajaV
      Level 2
      7 years ago

      Hi,

      So, you mean to say differential backup will take reference based on the previsouly ran full backup on same policy?

      Please confirm. 

      • sdo's avatar
        sdo
        Moderator
        7 years ago

        Yes, when a "diff" schedule is in a policy with any other full, cinc or diff schedule, then the next executing diff schedule will reference from any prior backup schedule, i.e. any of full, cinc, diff - i.e. whichever was most recent.

  • Marianne's avatar
    Marianne
    Level 6
    7 years ago

    RajaV

    What is purpose of backing up the same data for the same client in 2 different policies?

    Full and Incr schedules should be in the same policy.

    Incr backup is based on previous backups within the same policy. 

    • RajaV's avatar
      RajaV
      Level 2
      7 years ago

      What is purpose of backing up the same data for the same client in 2 different policies? - It's business requirement to complete the backup prior to an activity.

      Full and Incr schedules should be in the same policy - Yes, both policies having Full and Incr schedules.

       

      Incr backup is based on previous backups within the same policy. 

      Now My Question : You mean to say differential backup will take the reference based on the policy or it will take the reference based on the client name. Please let me know if my question is confusing you. :)