Backup and disaster recovery (BDR) is a combination of data backup and disaster recovery solutions that work cohesively to ensure a company’s business continuity.
Backup window is the timeframe within which backups are scheduled to run on a given system. These are often scheduled during times of minimal usage (i.e. after hours).
Btrfs (B-tree file system, pronounced as “butter F S”, “better F S”, “b-tree F S”, or simply by spelling it out) is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features while also focusing on fault tolerance, repair and easy administration. Jointly developed at multiple companies, Btrfs is licensed under the GPL and open for contribution from anyone.
Business continuity encompasses a loosely defined set of planning, preparatory, and related activities that are intended to ensure that an organization’s critical business functions will either continue to operate despite serious incidents or disasters that might otherwise have interrupted them, or will be recovered to an operational state within a reasonably short period.
Cloud disaster recovery is a component of a disaster recovery plan that involves maintaining copies of enterprise data in a cloud storage environment as a security measure.
Disaster recovery is the area of security planning that deals with protecting an organization from the effects of significant negative events. Significant negative events, in this context, can include anything that puts an organization’s operations at risk: crippling cyber-attacks and equipment failures, for example, as well as hurricanes, earthquakes and other natural disasters.
Disaster recovery as a service (DRaaS) is a cloud computing and backup service model that uses cloud resources to protect applications and data from disruption caused by disaster. It gives an organization a total system backup that allows for business continuity in the event of system failure.
Remote data backup is the process of backing up data created by remote and branch offices (ROBOs) and storing it securely. Businesses with ROBOs require backup and recovery solutions that can support the company’s data protection policies and business service levels.
Recovery time objective is a benchmark indicating how quickly data must be recovered to ensure business continuity following a disaster or unplanned downtime.
Recovery point objective is a benchmark indicating which data must be recovered for normal business operations to resume following a disaster or unplanned downtime. This is often based on file age (i.e. all data backed up before date X must be recovered), and in conjunction with RTO can help administrators determine how frequently backups should execute.
Full backup is a method where all the files and folders selected (or even an entire machine) will be backed up in their entirety. It’s commonly used as a first backup and is then followed up with subsequent incremental or differential backups.
When you perform a full backup, it’ll contain a complete backup of all selected data. When the next backup is scheduled to run, the entire list of files and folders will be copied again (regardless of whether or not any changes have been made). This simplifies the restore process, as the complete dataset lives in each and every backup task, but it also consumes the most storage space and can cause backups to take quite a bit of time to complete.
Differential backup is a process that begins with one full backup, and then subsequently backs up all changes that have been made since the previous full backup. This allows for much faster backups (but slower restores), and makes more efficient use of storage capacity.
Incremental backup is largely the same as differential backup, with one important difference – after the initial full backup, subsequent backups store changes that have been made since the previous backup cycle whether it was a full or an incremental cycle.
Mirror Backup is, as the name suggests, a real-time duplicate of the source being backed up. With mirror backups, when a file in the source is deleted, that file is eventually also deleted in the mirror backup. Because of this, mirror backups should be used with caution as a file that is deleted by accident, sabotage or through a virus may also cause that same file in mirror to be deleted. Some do not consider a mirror to be a backup.
Many online backup services offer a mirror backup with a 30-day delete. This means that when you delete a file on your source, that file is kept on the storage server for at least 30 days before it is eventually deleted. This helps strike a balance offering a level of safety while not allowing the backups to keep growing since online storage can be relatively expensive.
Many backup software utilities do provide support for mirror backups.
Advantages of Mirror backups
The backup is clean and does not contain old and obsolete files
Disadvantages of Mirror backups
There is a chance that files in the source deleted accidentally, by sabotage or through a virus may also be deleted from the backup mirror.
Local Backup is any backup where the storage medium is kept on-site. Typically, storage is plugged in directly to the source computer being backed up, or is connected through a local area network to the source being backed up. This is the most basic form of backup and data-loss prevention, and contains several inherent disaster-related risks as there is no offsite redundancy or cloud component.
Cloud or remote backup is a type of offsite backup that allows users to access restore or administer backups either while located at the source location or an offsite location. Data here is backed up in the cloud (either directly, or via a local appliance); this type of backup provides some of the strongest available protection against natural disasters and unplanned downtime.
Cloud backup solutions, also known as online backup focus on copying data files to a physically remote location, which is not very good for disaster recovery.
Hybrid backup is the combination of both cloud backup and local backup, where local backup is typically a USB drive or network shared drive or NAS device. Hybrid backup is the ideal!