a textual description of its current setting. To customize the settings for an interval , click on one of the

interval buttons. Most schedules are deﬁned in terms of the following intervals:

Daily — run on sequential weekdays.

Weekly — run once per week on the day speciﬁed by the user, for example, Friday.

Monthly — run once per month on a day speciﬁed by the user such as the ﬁrst day, the last day, the ﬁrst

Monday, and others. You can also specify how many months s hould elapse between monthlies. Setting

the monthly interval to every 3 months will create a backup ever y quarter.

Yearly —runonceperyearonaspeciﬁed day of the year. By increasing the interval you c an also

schedule a job to run once every so many years.

NOTE:

There are also Hourly and Minutely intervals that are less commonly used. The concepts behind using

them are similar to those of the intervals discussed above.

For all intervals there is a setting that controls the number of sets. This settings determines how many sets of

that backup interval will be created before Data Protector Express goes back and overwrites the ﬁrst. For

example, if your schedule starts in January and calls for three monthly sets, you will have a set for January,

a set for February, and a set for March. In April, the job will overwrite the set from January.

When conﬁguring a rotation the Calendar view displays the schedule graphically. The interval type for

each day is displayed in the calendar. Clicking on a day in the calendar will display the type of backup,

thewritemode,andthenameofthemediathatwillbeusedonthatday.

TIP:

You ca n change the interval for a given day of a schedule by right-clicking on the day in the calendar

and selecting the desir ed type.

You can prevent the job from running on a given day. This is helpful for times when you know the job won’t

completebecauseyouwon’tbeabletosupplytherightmediaforthejob—asinthecaseofholidays.

You can enable or disable jobs from running on speciﬁed days of the week by clicking the name of the day

in the heading of the c alendar view. For example, if you want daily backups on Saturdays.

Implications for Restoring Data

Intervals also deﬁne the g ranularity of the data you can restore. Rotations are set up to capture m ore

granularity in the recent past and less granularity as data gets older. Larger intervals, like Yearly and

Monthly, produce lower granularity data history. Smaller intervals, like Daily, produce higher granularity

history. Take, for example, a rota tion with three full monthly backup sets on the last day of each m onth,

four full weekly backup sets created on each Friday, and four incremental daily backup sets created

Monday through Thursday. Now suppose you have a critical ﬁle that changes daily. On Wednesday,

you are asked to retrieve the ﬁle as of a speciﬁc date. With this rotation you can roll back to the Monday

and Tuesday versions of the ﬁle in the current week and the Wednesday, Thursday, and Friday versions of

the ﬁle in the previous week. Beyond that, you will only have the versions of the ﬁle as they existed on

Friday for the previous four weeks previous to the current week. And b eyond that you will only have the

versions of the ﬁle that existed on the last day of the month for the previous three months.

The catalog keeps track of the ﬁles and versions that have been backed up so you don’t have to

rememb er what me dia they are on. This knowledge makes the restoration process very simp le. You only

need to specif y the ﬁles you want restored and Data Protector Express will prompt you for the m edia

it needs restore the ﬁles. Full reconstruction of data may require multiple m edia sets. For example, to

reconstruct the data for a Wednesday from a GFS 20 set rotation type, you will require the full backup

media set from the previous end of week and all of the incremental media sets from that week (that is,

Mondays, Tuesdays and Wednesdays). In some circumstances, the preceding full backup media set

User’s Guide

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 92 93

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Hp Data Protector Express Basic-Software Manuel d'utilisateur Page 51

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