All your web contents will be mirrored to secondary disk through RAID. If primary disk fail/error, secondary disk will continue to serve, this will prevent data lost and downtime from disk failure.
However, this is not the backup you should rely on to keep your contents safe, because all data deleted from primary disk will also be deleted from secondary disk at the same time. So, we recommend you to make your own backup before doing any updates or changes to your files and data. You are responsible for your backups and web contents.
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