ACRONIS Backup & Recovery 10 Advanced Server, ES Guide de l'utilisateur télécharger pdf (Page 217)

2 2 days 1 to 2 days 1 day

3 4 days 2 to 5 days 2 days

4 8 days 4 to 11 days 4 days

5 16 days 8 to 23 days 8 days

6 32 days 16 to 47 days 16 days

Adding a level doubles the full backup and roll-back periods.

To see why the number of recovery days varies, let us return to the previous example.

Here are the backups we have on day 12 (numbers in gray denote deleted backups).

1 2 3 4 5 6 7 8 9 10 11 12

A new level 3 differential backup has not yet been created, so the backup of day five is still stored.

Since it depends on the full backup of day one, that backup is available as well. This enables us to go

as far back as 11 days, which is the best-case scenario.

The following day, however, a new third-level differential backup is created, and the old full backup is

deleted.

1 2 3 4 5 6 7 8 9 10 11 12 13

4 1 2 1 3 1 2 1 4 1 2 1 3

This gives us only a four day recovery interval, which turns out to be the worst-case scenario.

On day 14, the interval is five days. It increases on subsequent days before decreasing again, and so

on.

1 2 3 4 5 6 7 8 9 10 11 12 13 14

4 1 2 1 3 1 2 1 4 1 2 1 3 1

The roll-back period shows how many days we are guaranteed to have even in the worst case. For a

four-level scheme, it is four days.

6.2.10.6 Custom backup scheme

At a glance

 Custom schedule and conditions for backups of each type

 Custom schedule and retention rules

Parameters

Parameter Meaning

Full backup Specifies on what schedule and under which conditions to perform a full backup.

For example, the full backup can be set up to run every Sunday at 1:00 AM as

soon as all users are logged off.

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ACRONIS Backup & Recovery 10 Advanced Server, ES Guide de l'utilisateur Page 217