Custom Backup Scheme - ACRONIS BACKUP AND RECOVERY 10 ADVANCED SERVER VIRTUAL EDITION - UPDATE 3 User Manual

4 8 days
5 16 days
6 32 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
4 1 2 1
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
4 1 2 1
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
4 1 2 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.
6.2.11.6

Custom backup scheme

At a glance
 Custom schedule and conditions for backups of each type

Custom schedule and retention rules
Parameters
Parameter
Full backup
Incremental
225
4 to 11 days
8 to 23 days
16 to 47 days
5 6 7 8 9
3 1 2 1 4
5 6 7 8 9
3 1 2 1 4
5 6 7 8 9
3 1 2 1 4
Meaning
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.
Specifies on what schedule and under which conditions to perform an
incremental backup.
If the archive contains no backups at the time of the task run, a full backup is
created instead of the incremental backup.
4 days
8 days
16 days
10 11 12
1 2 1
10 11 12 13
1 2 1 3
10 11 12 13 14
1 2 1 3 1
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