How to Back Up SQL Databases to the Cloud

For UK businesses running line-of-business applications — from accounting software like Sage and Xero to CRM platforms, ERP systems, and bespoke industry applications — the SQL database sitting behind those applications is often the single most valuable digital asset the business owns. It contains years of financial records, customer information, order history, and operational data. Losing it would not just be inconvenient; for many businesses, it would be catastrophic.

Yet despite this critical importance, SQL database backup remains one of the most poorly managed areas of IT in UK small and medium-sized enterprises. Many businesses rely on basic file-level backups that do not properly capture database state, leading to corrupted or incomplete restores. Others back up their databases to the same physical server or the same office location, leaving them vulnerable to hardware failure, ransomware, fire, flood, or theft. And a surprising number of businesses have never tested whether their SQL backups can actually be restored.

Cloud backup for SQL databases addresses all of these risks. By replicating your database backups to geographically separate, secure UK data centres, you gain protection against every category of data loss whilst ensuring rapid recovery when disaster strikes. This guide covers the what, why, and how of cloud SQL database backup for UK businesses.

Why SQL Databases Need Special Backup Treatment

SQL databases cannot be reliably backed up using the same file-copy methods used for documents and spreadsheets. A SQL database consists of data files (.mdf), transaction log files (.ldf), and in-memory structures that must be in a consistent state for a backup to be usable. Simply copying the .mdf and .ldf files whilst the database engine is running results in an inconsistent backup that may be completely unrestorable.

Proper SQL backup uses the database engine's own backup mechanism, which ensures transactional consistency. SQL Server, for example, supports three types of backup: full backups (a complete copy of the entire database), differential backups (changes since the last full backup), and transaction log backups (changes since the last log backup). A well-designed backup strategy combines all three to balance protection, storage efficiency, and recovery speed.

Cloud Backup Options for SQL Databases

Several approaches exist for backing up SQL databases to the cloud, each suited to different environments, budgets, and recovery requirements.

Option 1: Backup Agent with Cloud Storage

A backup agent installed on your SQL server performs native SQL backups and transmits them to cloud storage. Solutions such as Veeam, Acronis, Datto, and Azure Backup use this approach. The agent handles scheduling, compression, encryption, and transmission, whilst the cloud storage provides off-site retention with geographic redundancy.

This is the most common approach for UK businesses with on-premises SQL servers. It works with all editions of SQL Server, supports full, differential, and transaction log backups, and provides a familiar backup-and-restore workflow. Most solutions encrypt data both in transit and at rest, ensuring compliance with UK GDPR data protection requirements.

Option 2: SQL Server Backup to Azure Blob Storage

SQL Server 2012 SP1 and later support native backup directly to Azure Blob Storage using the BACKUP TO URL command. This eliminates the need for a separate backup agent and allows you to use SQL Server Management Studio or T-SQL scripts to manage backups. The backups are stored in an Azure storage account that you control, with configurable redundancy (locally redundant, zone-redundant, or geo-redundant storage).

Option 3: Azure SQL Managed Backup

For businesses using Azure SQL Database or Azure SQL Managed Instance, backup is automatic and fully managed by Microsoft. Full backups occur weekly, differential backups every 12-24 hours, and transaction log backups every 5-10 minutes. Backups are retained for 7-35 days depending on your tier, and long-term retention policies can extend this to up to 10 years.

Designing Your SQL Backup Strategy

An effective SQL backup strategy is defined by two key metrics: the Recovery Point Objective (RPO) and the Recovery Time Objective (RTO). The RPO defines how much data you can afford to lose — if your RPO is one hour, your backups must run at least every hour. The RTO defines how quickly you need to be operational again after a failure.

For most UK SMEs, a reasonable starting point is a full backup nightly, differential backups every four hours, and transaction log backups every fifteen to thirty minutes. This provides an RPO of fifteen to thirty minutes and, with cloud backup, an RTO of one to four hours depending on database size and internet bandwidth.

Retention and Compliance

How long you keep your SQL backups depends on your business requirements and regulatory obligations. The UK GDPR does not specify a mandatory retention period for backups, but it does require that personal data is not kept longer than necessary. Your retention policy should balance the need for historical recovery with data minimisation principles.

A typical retention policy for UK businesses might retain daily backups for 30 days, weekly backups for 12 weeks, monthly backups for 12 months, and annual backups for 7 years. Financial data may need longer retention under HMRC requirements, whilst personal data should be purged according to your data protection policy.

Cloud backup solutions make retention management straightforward through automated lifecycle policies. Backups that exceed their retention period are automatically deleted, ensuring compliance without manual intervention. This is a significant advantage over tape-based backup, where managing and tracking physical media for years is both burdensome and error-prone.

Testing Your Restores

A backup that has never been tested is not a backup — it is a hope. The only way to know that your SQL backups work is to restore them regularly and verify the data integrity. This should be a scheduled, documented process, not something you attempt for the first time during an actual emergency.

At minimum, perform a test restore monthly. Restore the latest full backup to a test environment, verify that the database is consistent (run DBCC CHECKDB), and confirm that applications can connect to and read from the restored database. Document the results, including the time taken for the restore, any errors encountered, and the state of the data.

For businesses with strict RTO requirements, conduct periodic disaster recovery drills where you simulate a complete server failure and work through the entire recovery process from backup retrieval to application verification. These drills reveal gaps in your recovery procedure that would otherwise only be discovered during a real emergency — when the pressure is highest and the stakes are greatest.

Ransomware Protection for SQL Backups

Ransomware is the most pressing threat to UK business data, and SQL databases are high-value targets. Modern ransomware variants specifically seek out and encrypt backup files alongside production data, rendering both the original database and its backups unusable. If your backups are stored on the same network as your SQL server, they are vulnerable.

Cloud backup provides several layers of protection against ransomware. First, the backup data is stored off-site and off-network, so ransomware that compromises your local environment cannot reach it. Second, many cloud backup solutions support immutable storage — once written, backup files cannot be modified or deleted for a defined period, even by an administrator. This means that even if an attacker compromises your backup credentials, they cannot destroy your backup history.

Third, cloud backup solutions maintain multiple versions of your data over time, allowing you to restore to a point before the ransomware infection occurred. This is critical because ransomware often lies dormant for days or weeks before activating, potentially contaminating recent backups. Having a deep retention history gives you the ability to reach back to a clean restore point.