How many backups are required from preparation to end of an upgrade and at which phases?
Take your daily online backups during the uptime phases as you would normally do. Please note that your system is still being used productively and you cannot afford data loss. In case of disaster, you will restore the daily backup, roll-forward up to the crash and roll-back the upgrade to re-start it from scratch. A backup is definitely needed at the beginning of the downtime phases as it is the point of no return. Another backup is needed before the go-live.
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