It's now 30% through the next back-up and is at 120GB of data. So, for example, this morning it backed up about 400GB. And, once it's done a back-up (say, like it did this morning taking hours) it then does the same process again at the next back up. However, when it backs up, it backs up a large amount of data. I have a WD external HDD connected via USB as a time machine back-up. Murphy’s law says that anything that can go wrong will go wrong… but with the 3-2-1 strategy in place, your data always survives.Amongst other macs, I have an iMac running Monterey. The 3-2-1 backup approach is also known as the 3-2-1-0 rule as it zeroes out the risk of data loss. Alternatively, you can build a hybrid cloud environment, enjoying the benefits of public cloud storage. If you run backup environment on StarWind VSAN, you can set up asynchronous replication to your remote location to ensure that your data is safe. It also supports prominent public cloud solutions like Wasabi and Backblaze B2. For now, StarWind VTL works with industry-leading cloud providers. StarWind VTL works great with Veeam Backup and Replication, bringing the benefits of the public cloud and object storage tiers. It seamlessly integrates into any backup infrastructure, so you do not need to do a forklift update to deploy it. StarWind offers StarWind Virtual Tape Library – a solution allowing to make backup processes faster and more cost-efficient. Virtual tape library with a public cloud storage tier may be a good alternative. However, tape-oriented infrastructures are expensive, hectic to maintain, and do not provide decent performance. Tapes are the cheapest media so far, and it is the most reliable one. Of course, you can keep backups on tapes that are sent to a remote location. But, hey, what about keeping data off-site? When it comes to backups, Veeam Backup & Replication seems the solution of choice. There are quite many ways to build an environment according to the 3-2-1 backup rule. How to build a rock-solid backup environment? This is the only way to ensure that at least one copy of your data withstands whatever bad that may happen to your office. Replicate it to your remote location in another country. That’s why you must always keep a copy out of the house… AS FAR AWAY AS IT IS POSSIBLE! Upload it to some public cloud storage. Obviously, data kept within one building will be destroyed in a disaster. So, effective combination of 2 formats allows getting the best of two worlds and avoiding the risk of losing your data due to the same hardware failure. The thing is, all storage media have own strong and weak sides. ![]() This being said, you need two independent storage media. Often, this happens because the devices were bought approximately at the same time and from the same vendor. Often, shortly after one disk goes down, you might experience the failure of another one from the same storage. For example, disks from the same RAID array are statistically dependent. Why do you actually need different media? The same storage types are prone to the same issues. Thinking of having numerous copies of data, the idea of keeping them on different media seems natural. This number is pretty miserable, just like the risk of losing all your data at once! 2 different media ![]() The risk of having all those 3 devices down at a time is 1/100 3 (1/1,000,000). In this way, the probability of failure for each of them is around 1/100. There are no common failure cases, and devices are used under more or less the same conditions. Let’s assume that the device where your original data resides is just the same as other 2 used to keep copies. Why are 3 copies enough? Here’s some quick math. This being said, the more data copies you have, the better it is for data safety. Whatever bad can happen may happen… And, having 3 copies saves you from an event like that. And, once it comes to keeping multiple copies of data, nobody will probably keep them all on one device, right? That thing may malfunction, the backup on it may turn out to be inconsistent, or it may be encrypted by ransomware. It is not smart to have just one copy of data. What do these numbers stand for? 3 copies of data This article discusses the 3-2-1 backup rule – a strategy to ensure that your data can withstand literally any disaster or error.
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