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I have a RAID5 array as my "master" drive. One drive can fail in that without losing the data (or interrupting the continuity of my work, too much)
Remember RAID isn't a replacement for backups. I back up regularly to a second RAID0 array, and also a removable hard drive. To lose my data completely the following sequence of events would have to happen (without any replacement/rebuild in the meantime)...
- two drives in the RAID5 array fail
and
- one drive in the RAID0 array fails
and
- the external drive fails
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