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Before you start your upgrade, it is strongly recommended that you create a backup of your DSpace instance. Backups are easy to recover from, ; a botched install/upgrade is very difficult if not impossible to recover from. The DSpace specific things to backup are: configs, source code modifications, database, and assetstore. On your server that runs DSpace, you might additionally consider checking on your cron/scheduled tasks, servlet container, and database.
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