Areca ARC-8050T3U 6-Bay Thunder3 Desktop RAID Storage Array - Manual (Page 84)

WEB BROWSER-BASED CONFIGURATION
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In some cases, you may want to export a SED key to store on
removable media or to use on a different computer. If you want
to create a backup copy of the SED key or use it on another
computer, you must first export the SED key. Exporting the SED
key puts it in a file (filename.bin) that you can then transfer to
another computer or put in a safe place.
4.7.5 Import Security Key
SED RaidSet created on an Areca RAID adapters can be migrated
to another RAID adapter. If you are importing a RaidSet originally
secured with a SED key, you need to import the foreign SED key
files to secure or unlock that RaidSet. The “Import Security Key”
file is for Raidset Roaming or Change SED Key function. If you
roam a RaidSet from old controller to another new (with Security
Functions support), the foreign SED key file must be imported
before it can be used.