Back up the platform itself
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Add a separate storage target first
Only targets no plan stores to are offered: a backup of the catalogue on the same target as the backups it describes would be lost with them. See Add a storage target.
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Generate the recovery kit
Each self-backup file is encrypted with the platform key and the recovery key, so the kit opens it on a machine that never ran the platform.
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Open Admin › Self-backup, pick the Target and save
It runs daily at 02:30 UTC.
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Click Run it now and check Last success