{"id":3636,"date":"2020-12-14T15:45:19","date_gmt":"2020-12-14T14:45:19","guid":{"rendered":"https:\/\/blog.archiware.com\/blog\/?p=3636"},"modified":"2021-03-31T12:23:24","modified_gmt":"2021-03-31T10:23:24","slug":"what-is-the-3-2-1-backup-rule","status":"publish","type":"post","link":"https:\/\/blog.archiware.com\/blog\/de\/what-is-the-3-2-1-backup-rule\/","title":{"rendered":"What is the 3-2-1 Backup Rule and is it relevant in 2021?"},"content":{"rendered":"
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By Dr. Marc Batschkus<\/p>\n\n\n\n

It is a classic among Backup rules and still you might not have heard about it or don\u2019t know exactly what it is.  This is why we\u2019ll take a closer look at the 3-2-1- Backup<\/strong> rule here.<\/p>\n\n\n\n

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The 3-2-1 rule for Backup means you need:
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3 copies of your files, 
on 2 different types of media, 
at least 1 of which must be stored offsite. <\/p>\n<\/div><\/div>\n\n\n\n

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What is the reasoning behind the 3-2-1- Backup rule?<\/strong><\/h2>\n\n\n\n
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Let\u00b4s take a step back and look at the definition of Backup: a Backup is a duplication of data that is needed for current production. <\/p>\n\n\n\n

W. Curtis Preston defines Backup as: a secondary copy of your primary data.<\/p>\n\n\n\n

Creating and maintaining 3 copies is important for professional security. Since the Backup of the primary data is mostly physically close to the original storage, it is quickly accessible and great to trigger a quick restore. The disadvantage is that if there is a local incident, usually both the original storage and the Backup can be affected either physically or via a network connection. This is why a third copy is so important. This should be an offsite copy to protect against local threats.\u00a0It is also important to have this copy offline. With removable media like tape, this is a given. It is lacking when copying data to remote disk storage.<\/p>\n\n\n\n

Using 2 different storage media is important to protect against any incidents and faults that are technology dependent. This could mean physical vulnerability, a faulty firmware, a magnetic field interference, power surge, etc.<\/p>\n\n\n\n

In reality, this offers several options:<\/strong><\/p>\n\n\n\n

Combining disk and LTO tape, disk and cloud, SSD and disk, SSD and tape, SSD and cloud.<\/p>\n\n\n\n

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Disk and SSD<\/strong><\/h3>\n\n\n\n

If your primary data is on SSD\/Flash storage, hard disk storage can come in as a Backup storage and different medium to protect against technology-specific faults.<\/p>\n\n\n\n

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Disk and LTO Tape<\/strong><\/h3>\n\n\n\n

In recent time, there have been suggestions to expand the 3-2-1 rule to a 3-2-1-1 rule. The last number meaning one copy stored offline. This is due to the increasing threat of attacks of different kinds. Only a storage medium that is offline can efficiently protect against dangers that spread via network.<\/p>\n\n\n\n

LTO tape has the advantage of combining offsite storage with offline and air gap features. This way, files are protected against any threats that come in over the network like malware, viruses and attacks. Files on a tape are safe in all theses cases.<\/p>\n\n\n\n

Learn more on the features and security layers of LTO:<\/p>\n\n\n\n

<\/div>\n\n\n\n
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Was ist LTO Tape und wie funktioniert es<\/a><\/blockquote>