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How to Secure Backups During Transfer

#1
11-11-2023, 05:34 AM
Backups during transfer focus on securing your data while it moves from one location to another. You need to consider how you transmit that data, whether it's from an on-premises database to a cloud storage solution, or between two physical machines. Regardless of your setup, encryption usually serves as the first line of defense. You can use symmetric encryption algorithms like AES-256 for this purpose, as they provide strong protection. If you're sending data over the internet, I recommend you wrap everything in SSL/TLS. This acts like a secure tunnel, protecting the data from eavesdroppers.

Let's talk about transport layer security. If you're transferring backups over protocols like FTP or SFTP, opting for SFTP would be a no-brainer. SFTP encrypts the entire session, both the data and the commands being sent. With FTP, you'd need to use FTPS, which adds an extra layer but has complexities like managing multiple ports and certificate configuration. If you want straightforward security without much hassle, stick to SFTP.

For large databases, consider chunking your data into smaller, manageable pieces before transferring. Not only does this help with recovery time if the transfer fails mid-way, but it also allows for parallel transfers, speeding things up. You can set the chunk size depending on the network conditions. For instance, sending 1GB chunks would be ideal for stable, high-speed connections, whereas smaller chunks might work better on slower links.

You can also implement some form of integrity check to ensure that the data you've transferred has not been tampered with. Using hash functions like SHA-256 can help you create a checksum for your backup. After the transfer, you run the same hashing algorithm on the destination and compare the results. If they match, you're in the clear. This gives you confidence that what you sent is what you received.

You might also want to think about how your data is authenticated during transfer. Using public-key cryptography, you can generate a pair of keys - a public and a private one. Share the public key with the entities receiving your data. They can encrypt the data using that public key, and only you, with your private key, can decrypt it on your end. It adds an extra layer of security, especially when you don't fully trust the network you're sending over.

Developing a solid transfer protocol won't suffice without considering how to manage access controls. You should limit who can initiate backup transfers. Utilizing role-based access control (RBAC) can help you fine-tune permissions. You can determine which users or roles can access what data and from which locations, effectively minimizing exposure. If you have a diverse team, regularly auditing user permissions ensures no unauthorized changes have crept in over time.

You should also consider redundancy in your transfer mechanisms. Relying on a single pathway can be a point of failure. Implement multiple transfer methods-like collocating a physical transfer method with a cloud service. This way, if one method fails-say, your internet goes down-you've got a fallback.

On the topic of targeting specific types of backups, let's not forget about the difference between full and incremental backups during transfer. A full backup captures everything at once but takes longer to transfer. Incremental, on the other hand, only backs up the data that has changed since the last backup was completed, significantly speeding up transfer times. For databases that undergo frequent changes, this can be highly effective. However, be aware that during recovery, you may need both the last full backup and all subsequent incremental backups.

Regarding cloud transfers, ensure that you're aware of the data residency regulations governing the areas you operate in. If you're sending backups to a cloud provider, make sure their storage locations comply with your organization's compliance requirements. You wouldn't want to find yourself in hot water for mishandling sensitive data.

Let's also consider alerting mechanisms. Setting up automated notifications via monitoring tools can inform you of the status of your transfer. You want to know when a transfer completes, fails, or even if there's been a significant delay. Logs help here, too. They're handy for auditing who accessed what data and when, which helps during security assessments.

Using APIs provides a modern approach to enhancing your backup transfer workflow. You can configure different services to work together via HTTP-based requests, automating the transfer and backup process. Consider building your scripts that utilize these APIs to enforce your security protocols. This level of automation can further reduce human error, tailoring your solution to the specific needs of your environment.

In a hybrid scenario where you're juggling on-prem and cloud databases, be watchful of your bandwidth limits. Cloud providers often impose data transfer limits that might affect your backup strategy. If you continuously hit those limits, consider staging backups during off-peak hours. This should improve performance and ensure you can transfer without interruption.

Let's talk about packet loss, another worry when transferring backups. Implement Quality of Service (QoS) on your network. Prioritizing backup traffic can help you in ensuring that your transfers go through smoothly, even if the network is busy. This is vital in environments where bandwidth isn't infinite, as it allows you to allocate the required resources dynamically based on your needs.

Working with a wide array of backup technologies, I realize the importance of reliable solutions. Each has its pros and cons. Some may prioritize speed while others focus on recovery options. Infrastructure can dictate what fits best. For instance, if you utilize cloud services predominantly, you might lean towards a solution tailored for cloud storage integration, ensuring seamless transfers. On physical servers, the bottlenecks often reside in disk I/O, so consider solutions with efficient deduplication and compression to optimize transfer times.

With the growing landscape of backups and storage options, I would like to introduce you to BackupChain Backup Software. It's an efficient, reliable backup platform designed for SMBs and professionals that supports a wide range of environments, including Hyper-V, VMware, and Windows Server. It's worth considering for efficient backup management without all the hassle usually associated with data protection.

steve@backupchain
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Joined: Jul 2018
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How to Secure Backups During Transfer

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