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3-4
Experience suggests that a three-tier system of data diskette backup provides the best insur-
ance against data loss. For example, the first day you work' on a project, label the diskette you
have used version "A." At the end of the day, copy this original onto a second blank, or
"scratch" diskette, and label the latter version "B."
Data Diskette Backup
Figure 3-3
The next day, insert the "B" diskette in your ADVANTAGE and make all additions or revisions
to that version. At the end of the day, copy version "B" onto another scratch diskette, and label
this third copy "C."
The next day, do all your work on version "C." At the end of the day, copy your results back
onto the diskette containing version
"A."
Continue on through this cycle, working on, and
updating each diskette in turn.
There is a major advantage to this method. At any given time, you have three diskettes contain-
ing some version of the same material. If only two versions exist, you run a risk that both can be
lost, since both must be present in the computer simultaneously when you copy from one
diskette to the other. If a power transient or program failure occurs while you are copying, then
both versions may be destroyed. If a third copy exists, you can use it to recover your data.
Whatever method you prefer, develop and use a systematic backup procedure. Protect your
financial investment in your programs and the effort and energy your data represent, by
taking the time to copy your diskettes regularly.
ADVANTAGE User Manual
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