![]() ![]() If you can eliminate duplication before ever sending the backups, it gives you an option not possible with any other method – send your backups directly to wherever they need to go. Backup directly off-site using source duplication This allows backups over much smaller connections. Source duplication is a more modern method that eliminates duplicate data before sending backups across the network – eliminating the duplicate data at the source. Target deduplication is where you use a traditional backup software to send full and incremental backups to an appliance that deduplicates them at the target – where the data is being sent. Deduplication can reduce by two orders of magnitude the size of data that needs to be replicated.īefore discussing this topic, it’s important to understand the difference between target deduplication and source deduplication. Replication of backups is possible if backups are deduplicated, and you have sufficient bandwidth. You would first send your backups to disk, then copy them to tape, then hand the copied tape to the man in a van. The on-site backup used for operational restores could be disk or tape. You do still have the risk of lost data unless you encrypt your backups, though. This addresses many of the previously mentioned downsides, as it allows you to send the latest backup off-site without affecting the RTO of operational recoveries or placing the only copy of your latest backup at risk. The next method is very similar to the first, but instead of sending your original off-site, you send a copy. The Catch-22 decision of having to decide between a good disastar-recovery RPO and a good operational recovery RTO is a significant one, as is the risk of lost data by physically shifting media – especially important because the tapes in question are the only copy of your backup. ![]() The main advantages of this method are simplicity and a reduction in media costs. Any time you hand tapes to a man in a van, you are opening yourself up to risk. Unless all of your backups are encrypted as they are being written to tape, the loss of any of your backups might need to be reported, especially if you are subject to data-privacy laws or regulations. Any recovery time objective (RTO) for operation recoveries would have to account for the amount of time it takes to get the tape back on site.Īnother downside is the risk of physically shipping media. Since operational restores are the ones you do most often, this is the most significant downside of this method. On the other hand, you want to use an older tape because sending last night's backup off-site would make it unavailable for day-to-day operational restores. This would allow you to meet a lower recovery point objective, or RPO. If you use the latest tape, you will be able to restore from your most recent backups if you have a disaster. ![]() Because you are using your original backup tape, you have two choices: use the latest tape or an older tape. The oldest method is to hand to a “man in a van” the original tapes that contain your backup, but it comes with a number of downsides. Here are the various ways that people get data their off-site. The method you choose to get the data to another location will determine the likelihood and cost of such an event. If you put them somewhere else, you at least have a chance at restoring data when the worst happens. If you store your backups in the same place you create your data, your backups will get destroyed along with your data. Everyone agrees that backups must be sent off site in order to protect your data from large disasters such as fire, earthquake, tornado, hurricane or flood. ![]()
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