ACRONIS Backup & Recovery 10 Advanced Server Virtual Edition User's Guide Page 156

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Simple backup scheme is disabled, because backup consolidation is impossible for archives located
on tapes.
Acronis Backup & Recovery 10 provides automation of tape rotation for Grandfather-Father-Son,
Tower of Hanoi, and Custom backup schemes.
Grandfather-Father-Son (p. 36) (GFS) and Tower of Hanoi (p. 40) (ToH) are the most popular backup
schemes to use on tape library devices. These schemes are optimized to maintain the best balance
between a backup archive size, the number of recovery points available from the archive, and the
quantity of required tapes for archiving.
If your backup archive must provide recovery with daily resolution for the last several days, weekly
resolution for the last several weeks and monthly resolution for any time in the past, the most
preferred scheme for you is the Grandfather-Father-Son scheme.
If the main goal is to provide data protection for the longest period with the minimal number of used
tapes permanently loaded into a small tape library (e.g. autoloader), the best solution is to probably
choose the Tower of Hanoi scheme.
The Custom backup scheme enables you to specify a backup schedule and retention rules to define a
desired tape rotation. Use this scheme, when the Grandfather-Father-Son and the Tower of Hanoi
schemes’ usage is not enough. For example, if the full size of protected data is considerably less than
the size of a tape, the best choice is to use the Custom backup scheme with regular
daily/weekly/monthly full backups, some simple retention rules, and tape options by default.
Criteria of the choice
Every time you are about to design a tape rotation scheme for a backup policy/plan to be created,
you ought to come from the following arguments:
full size of the data to protect
approximate size of the daily changes of data
approximate size of the weekly changes of data
requirements for the backup scheme (frequency, performance and duration of backup
operations)
requirements for keeping backups (minimal/maximal period of backup keeping; need to store
tape cartridges off-site)
capability of the tape library (number of drives, loaders, slots and available tapes; capacity of
tapes)
requirements for performing data recovery (maximal duration)
You need to analyze every argument that is relevant for your case and select the main criteria for the
choice. Then choose a backup scheme and specify the tape options.
Note, that any backup scheme in combination with different tape options will have quite different
results for efficient use of both tapes and devices.
Case to analyze
Suppose you need to automate a tape rotation for the case if:
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