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I'd suggest simply backing up your files in your current database and, if need be, restoring them after your upgrade.
One way to do this might be to use mysqldump.
EXAMPLE:
mysqldump --opt -u USER -p PASSWORD --all-databases > all.sql
Please refer to your system documentation for details on your alternatives, and for the exact syntax for doing a backup and corresponding restore.
Depending on how "mission critical" this data is, you might also consider doing a "pilot upgrade" on a test system before updating your production system.
'Hope that helps .. PSM
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