ACRONIS Backup & Recovery 10 Advanced Server User's Guide Page 204

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204 Copyright © Acronis, Inc., 2000-2010
Start backup at: 12:00 PM
Back up on: Friday
Weekly/monthly: Friday
Keep backups:
Daily: 1 week
Weekly: 1 month
Monthly: indefinitely
Backup is thus performed only on Fridays. This makes Friday the only choice for weekly and monthly
backups, leaving no other date for daily backups. The resulting “Grandfather-Father” archive will
hence consist only of weekly differential and monthly full backups.
Even though it is possible to use GFS to create such an archive, the Custom scheme is more flexible in
this situation.
Tower of Hanoi scheme
At a glance
Up to 16 levels of full, differential, and incremental backups
Next-level backups are twice as rare as previous-level backups
One backup of each level is stored at a time
Higher density of more recent backups
Parameters
You can set up the following parameters of a Tower of Hanoi scheme.
Schedule Set up a daily (p. 163), weekly (p. 165), or monthly (p. 167) schedule. Setting up
schedule parameters allows creating simple schedules (example of a simple daily
schedule: a backup task will be run every 1 day at 10 AM) as well as more complex
schedules (example of a complex daily schedule: a task will be run every 3 days, starting
from January 15. During the specified days the task will be repeated every 2 hours from
10 AM to 10 PM). Thus, complex schedules specify the sessions on which the scheme
should run. In the discussion below, "days" can be replaced with "scheduled sessions".
Number of levels Select from 2 to 16 backup levels. See the example stated below for details.
Roll-back period The guaranteed number of sessions that one can go back in the archive at any time.
Calculated automatically, depending on the schedule parameters and the numbers of
levels you select. See the example below for details.
Example
Schedule parameters are set as follows
Recur: Every 1 day
Frequency: Once at 6 PM
Number of levels: 4
This is how the first 14 days (or 14 sessions) of this scheme's schedule look. Shaded numbers denote
backup levels.
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
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