Backup strategies – Definition and meaning

Needs and objectives of backup strategies

Backup strategies are a central pillar of IT security. They protect sensitive data from loss and ensure its recovery. Their main task is to specifically mitigate risks such as technical failures, user errors, malware infections or even natural disasters. If systems fail, there is a risk of irretrievable data loss without a coherent backup concept. The selection and implementation of a suitable backup solution is therefore one of the fundamental measures for protecting relevant information, both in the corporate environment and in the private sphere.

Core principles and methods of data backup

The design of a backup strategy depends on factors such as data volume, required availability and technical possibilities. Common methods include

• Full backup: All selected data is backed up completely. The advantage of this is that data can be restored quickly in an emergency, but it requires more storage space and longer backup times.
• Incremental backup: Only the data that has changed since the last backup is included in the backup. This method saves storage space and time, but requires the interaction of several backup statuses when restoring.
• Differential backup: All changes since the last full backup are backed up. This often makes data recovery easier than with incremental backups, but the storage requirements are higher.

With the increasing complexity of IT landscapes and the frequency of cyber attacks, many companies are also turning to snapshots and continuous replication. These methods make it possible to quickly return to a consistent state in the event of ransomware attacks or hardware defects, for example, and thus prevent longer downtimes.

Practical implementation and examples of backup strategies

A widely established procedure is the 3-2-1 rule: three copies of important data should be backed up on at least two different storage media, with one copy being stored externally. A medium-sized company that creates daily incremental backups on a central storage server, makes weekly full backups on external hard drives and also stores monthly backups in a cloud solution can be used to illustrate this.

Private households, on the other hand, often benefit from a combination of local backups on USB drives and the use of cloud services such as Google Drive or OneDrive. For example, photos and personal documents are backed up independently of each other.

Scenarios for targeted strategy selection:

• Medical practice: Daily, encrypted backup of sensitive patient data on local media and a GDPR-compliant cloud to comply with data protection regulations.
• Graphic design agency: Combination of version control and backups to secure project statuses and easily roll back accidental changes.
• Industrial company: Continuous replication of relevant production data to an outsourced data centre to maintain business operations even in the event of fire damage or flooding.

Advantages, limitations and recommendations

Well thought-out backup strategies enable companies and users to reliably restore data in the event of a disaster or attacks on the IT landscape, for example. Important advantages are

• High recovery capability after loss or damage to data
• Minimisation of downtimes and follow-up costs in the event of emergencies
• Legally compliant archiving, particularly with regard to data protection and tax law
• Efficient response to threats such as ransomware

However, the continuous maintenance of backup strategies involves a considerable amount of effort. Ongoing costs, regular recovery tests and well thought-out monitoring of all backup processes are necessary to ensure the ability to act in the event of an emergency. If backups are not carried out correctly or too infrequently, up-to-date and usable data stocks will be missing in an emergency.

Recommendations:

• Regularly review backup concepts and adapt them to the current IT landscape
• Use automated and documented backup solutions wherever possible
• Keep several versions in order to be able to reconstruct accidentally deleted or overwritten data
• Carry out test restores at least every six months to ensure the functionality of the backups

Hybrid backup solutions that combine local and cloud-based components often prove their worth. They offer customised protection and can be flexibly adapted to company-specific risks and requirements. This ensures access to backed-up data even in exceptional situations.