What, exactly, is your backup service provider offering?
Outsourced backup services vary, from simply providing raw storage space, like Amazon's S3, to
What's your escrow policy?
A lot of companies are jumping into backup SaaS and not all of them are going to stay in the business. How will you get your data back if something happens to your backup provider?
How fast is your connection?
The speed of your connection is critically important to a remote backup's performance. However, the connection speed will probably need to be determined empirically at the time when you will be doing your backup. You should check your actual, versus the theoretical connection speed over the network.
What is your guaranteed throughput?
Connection speed is only one of the factors that goes into throughput. The vendor should offer a service-level agreement (SLA) for you to examine. The SLA should include a guaranteed throughput. Note that the vendor will probably only guarantee the output from its server, not the speed of your connection. That's beyond the vendor's control.
How long will it take to back up my data?
Next to price, this is the key number. You need to stay inside your backup window with room allowed for the inevitable growth in the size of backups.
In a well-run IT shop, the user should have this information already since it's a critical metric in managing storage of any sort. The simplest, but not the most accurate, method of figuring storage growth is to establish a historical trend line by comparing the size of your data at different points in time. Most storage management programs will also provide a figure for storage growth that is often more accurate than a simple historical comparison.
How long will it take to restore my data?
Restoration takes longer than backup -- sometimes a lot longer if you're using data deduplication or incremental backups to reduce the size of uploads. Be sure to ask your vendor how long it will take to restore your data, and then make sure that number is in the SLA. Note that the actual time to restore also depends on the bandwidth of your connection, not just how fast the vendor's server can pump out the data.
What range of backup sizes do you handle?
Vendors tend to segment their market by the amount of data to be backed up (or, in the case of a vendor offering deduplication, by the amount of data transmitted and stored). Many vendors offer different size ranges at different prices, but some are specialized in a particular size range. The best way to determine what size range a particular plan is aimed at is to ask the vendor. The alternate method is to study the rate schedule and work out the prices for your specific case from that.
What security measures -- physical and virtual -- do you have in place?
Ideally, the servers and storage used for backup data should be located in a separate, physically secure area and replicated on more than one storage array. Some vendors replicate the data to more than one site. In addition, the data should be protected by encryption or other security measures to prevent unauthorized access, including by vendor employees.
What disaster recovery and business continuity measures do you have in place?
The vendor should have a comprehensive disaster recovery plan and enough redundancy to make sure you can get to your backups if you need them.
In the event of a disaster, what methods can I use to get my data back?
It can sometimes take more than 24 hours to do a full recovery down the same link it was uploaded over. For that reason, some vendors offer alternate methods of getting the data back to you. For example, some companies will put your data on a USB drive and express it back at your request. Because reloading from a local file system is so much faster than downloading the data, this can be faster.
What will outsourcing backup cost?
Finally, what's the total monthly cost for your backups? This almost always varies with the amount of data being backed up, and often with the service-level guarantees, but it often is more than simply multiplying the amount of data by the price per gigabyte at a given level of service. There are often setup fees, minimum charges and capacity charges figured as bands (i.e., 2 GB to 4 GB is the same price)
Although what you're interested in is the total cost, it's important to be sure you're comparing apples to apples. Don't simply look at the cost per gigabyte. Compare the total price for the amount of data you have now and what you reasonably expect to have in the future. If you're near the top of the band for a vendor's plan, your growth can push you into the next –- and more expensive-- band. (Assuming the vendor uses capacity bands. Some just charge per gigabyte rather than for a range of gigabytes.) Also consider future growth in comparing costs. If you're at the top of a capacity category now, you can expect that your costs will jump significantly when your data grows across the boundary to another category.
About the author: Rick Cook specializes in writing about issues related to storage and storage management.
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This was first published in January 2009