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How does VDP incremental backup really work?

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Hi,

 

I'm a little bit confused about how VDP incremental backup really work.

 

VDP-timeline.jpg

 

Let's say I use 7 days retention policy.

On the first day, VDP does full backup. Then on, the subsequent backups after full backup are always be incremental.

 

My questions are:

  1. On day 8, VDP would run another backup job. To comply with the policy, will VDP delete backup on Day 1 or will it merge Day 1 & Day 2 backups into one? My confusion is, if VDP delete backup on Day 1, the subsequent backups after full backup will be useless.
  2. If VDP does merge Day 1 & 2 backups, what type of backup (full or incremental) would VDP do on Day 8?

 

I hope my questions are clear enough.

 

Note: I'm using VDP 5.1 (if there is any behavior difference between 5.1 & 5.5).

 

Thank you.

 

Regards,

Apenk


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