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Whether to go with a SAN isn't really about what you have as it is about what you need or want. With a SAN you will get a highly reliable, wickedly fast storage resource. Is that what you need? Is it worth the incremental cost to you?
The amounts of data you cite are quite small. You can get 80 gig on one hard drive these days. If the time it takes to backup is your sole consideration, you might look at hybrid strategies such as an on-line copy followed by a backup to tape at your leisure. However, the time you cite to backup 80 gig is longer than I would expect. You might want to check that your systems have enough memory and that your hardware architecture is up to date.
Bottom line: There is nothing about your environment that says, "don't use a SAN." The question is whether you would be getting your money's worth relative to the alternatives.
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