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I am going to buy a NAS server soon. I am pretty sure I know the one I am going to get.

It can hold 4 hard drives.

If I RAID 5 then I will have about 8gigs of storage.

I understand if there is mechanical failure with a drive - the RAID can re-build a new drive that is inserted.

But...

For added peace of mind, should I be replicating everything to another NAS or RAIDING 2 drives and replicating on to 2 drives.

I am not a server specialist. Just someone who wants security on a small budget.

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The only good backup is an off-site backup. (Think of theft, fire, ...) –  Hennes Aug 26 '13 at 15:21
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migrated from stackoverflow.com Oct 25 '11 at 10:56

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1 Answer

If the data is important, it should always be kept in at least two separate places.

When one drive in a RAID-5 array fails, your data can be lost completely if there is a second failure during the rebuilding of the data on the replacement drive.

You might want to have a separate copy in case the RAID enclosure catches fire or is stolen.

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