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I know there are many who dislike the Drobo, but I have been extremely happy with mine. I have a first edition Drobo and have had it running constantly for years with out any issues. I started with 2 1tb drives and then added a 2tb drive when my Drobo told me I needed more storage. No issues.
Yes it is slow but for my purposes that is not a problem at all. I use my Drobo as a Time Machine backup for 3 Macs which are on my home network. I control the amount of space each machine uses on the Drobo with an app called "Time Tamer".
A Drobo certainly does not fit everyones needs, but it fits mine. Only you can evaluate if it fits yours.
 
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