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DDS Tape Module
Backup Routines
36
DDS Tape Module
Model 3: Monthly and Weekly Rotation with Daily Backup
Number of cartridges needed: 6 sets for full backup
4 sets for partial backup
The backup model which offers optimum data protection uses six full backup sets (three monthly and
three weekly), and four sets for daily partial backups. This model is recommended if you compile large
quantities of data where loss would be disastrous. It also provides the best method of securing data from
software viruses.
The four sets of cartridges for daily partial backup are labeled Monday, Tuesday, Wednesday, and
Thursday, as in model 2.
Three sets of cartridges are used in rotation for a weekly full backup on Fridays. Two of these sets are
stored off-site. After a full backup is made on Friday, the set of cartridges is taken off-site and exchanged
for the oldest backup set in storage. Next Friday, the backup is made using this oldest set of cartridges. In
this way, at any moment, three generations of a full weekly backup exist; the two most recent are off-site,
and the oldest is on-site ready for the next backup.
The final three sets of cartridges are used for a full backup on the first working day of each month, again
in rotation. This is in addition to the usual backup that would be made that day, so the normal routine is
maintained. As with the weekly cartridges, the monthly sets should be stored off-site.