First Backup Time

[handian.sudianto]

Hello,

When we backup large volume/disk using veeam agent and 1st full backup take more than 1 day, what happened if when full backup running for some days and there are changes on the disk. Will the full backup is tp to date?

[Mildur]

Hello Handian

Veeam Agent creates a Microsoft VSS snapshot when the backup job starts. The Agent then reads the data from the VSS snapshot and stores the data compressed on the backup repository target.
Changed data after the snapshot will not be protected by the the initial full backup.

- User Guide - How Backup Works

Best,
Fabian

[handian.sudianto]

So all changes when full backup in progress will be done by next incremental backup, am i right?

[Mildur]

The entire procedure repeats itself with each backup session:
1) The backup session (full and incremental) takes a new VSS snapshot of the current state of the machine
2) Agent reads the data from the VSS snapshot and stores it to the backup repository
3) VSS snapshot is deleted.

So all changes

Only the version of your data which exists when the VSS snapshot is created by the backup job.


Best,
Fabian

[handian.sudianto]

Let say on 1 Oct the agent do 1st full backup with size 20TB and need 7 days to complete the full backup.
On 8 Oct the agent will do incremental backup, this incremental will backup all changes from 1 Oct until 8 Oct?

[Mildur]

It will create a backup of the machine with the exact state as it was on Oct 8th.

Example:
- Is a new file created on Oct 2nd and still on the machine on Oct 8th --> Yes, it will be in the backup on Oct 8th.
- Is a new file created on Oct 2nd but deleted on Oct 4th --> No, it won't be in the backup on Oct 8th.
- Was a file edited on Oct 2nd, Oct 3rd and Oct 5th and still on the machine on Oct 8th --> Only the last version of this file from Oct 5th will be in the backup.

Best,
Fabian

[handian.sudianto]

If full backup already done and the source server upgraded to newer OS version, will the full backup still can be used or the agent will create another a new full backup?