Remote backup service

A remote, online, or managed backup service, sometimes marketed as cloud backup or backup-as-a-service, is a service that provides users with a system for the backup, storage, and recovery of computer files. Online backup providers are companies that provide this type of service to end users (or clients). Such backup services are considered a form of cloud computing.

Online backup systems are typically built around a client software program that runs on a schedule. Some systems run once a day, usually at night while computers aren't in use. Other newer cloud backup services run continuously to capture changes to user systems nearly in real-time. The only backup system typically collects, compresses, encrypts, and transfers the data to the remote backup service provider's servers or off-site hardware.

There are many products on the market – all offering different feature sets, service levels, and types of encryption. Providers of this type of service frequently target specific market segments. High-end LAN-based backup systems may offer services such as Active Directory, client remote control, or open file backups. Consumer online backup companies frequently have beta software offerings and/or free-trial backup services with fewer live support options.

History

In the mid-1980s, the computer industry was in a great state of change with modems at speeds of 1200 to 2400 baud, making transfers of large amounts of data slow (1 MB in 72 minutes). While faster modems and more secure network protocols were in development, tape backup systems gained in popularity. During that same period the need for an affordable, reliable online backup system was becoming clear, especially for businesses with critical data.

Remote Backup Systems, formerly known as Quantum Tech and founded in 1987 by Rob Cosgrove, was the first company to offer remote backup solutions to service providers and still operates to this day. Also in 1987 he wrote the first book on remote backup services, The RBS Book: How to Start and Operate a Remote Backup Data Service.[1]

More online/remote backup services came into existence during the heyday of the dot-com boom in the late 1990s. The initial years of these large industry service providers were about capturing market share and understanding the importance and the role that these online backup providers were playing in the web services arena. Today, most service providers of online backup services position their services using the SaaS (software as a service) and PaaS (Platform as a service) strategy and its relevance is predicted to increase exponentially in the years to come as personal and enterprise data storage needs rise. The last few years have also witnessed a healthy rise in the number of independent online backup providers.

Characteristics

Service-based

  1. The assurance, guarantee, or validation that what was backed up is recoverable whenever it is required is critical. Data stored in the service provider's cloud must undergo regular integrity validation to ensure its recoverability.
  2. Cloud BUR (BackUp & Restore) services need to provide a variety of granularity when it comes to RTO's (Recovery Time Objective). One size does not fit all either for the customers or the applications within a customer's environment.
  3. The customer should never have to manage the back end storage repositories in order to back up and recover data.
  4. The interface used by the customer needs to enable the selection of data to protect or recover, the establishment of retention times, destruction dates as well as scheduling.
  5. Cloud backup needs to be an active process where data is collected from systems that store the original copy. This means that cloud backup will not require data to be copied into a specific appliance from where data is collected before being transmitted to and stored in the service provider's data centre.

Ubiquitous access

  1. Cloud BUR utilizes standard networking protocols (which today are primarily but not exclusively IP based) to transfer data between the customer and the service provider.
  2. Vaults or repositories need to be always available to restore data to any location connected to the Service Provider’s Cloud via private or public networks.

Scalable and elastic

  1. Cloud BUR enables flexible allocation of storage capacity to customers without limit. Storage is allocated on demand and also de-allocated as customers delete backup sets as they age.
  2. Cloud BUR enables a Service Provider to allocate storage capacity to a customer. If that customer later deletes their data or no longer needs that capacity, the Service Provider can then release and reallocate that same capacity to a different customer in an automated fashion.

Metered by use

  1. Cloud Backup allows customers to align the value of data with the cost of protecting it. It is procured on a per-gigabyte per month basis. Prices tend to vary based on the age of data, type of data (email, databases, files etc.), volume, number of backup copies and RTOs.

Shared and secure

  1. The underlying enabling technology for Cloud Backup is a full stack native cloud multitenant platform (shared everything).
  2. Data mobility/portability prevents service provider lock-in and allows customers to move their data from one Service Provider to another, or entirely back into a dedicated Private Cloud (or a Hybrid Cloud).
  3. Security in the cloud is critical. One customer can never have access to another’s data. Additionally, even Service Providers must not be able to access their customer’s data without the customer’s permission.

Enterprise-class cloud backup

An enterprise-class cloud backup solution must include an on-premises cache, to mitigate any issues due to inconsistent Internet connectivity.[2]

Hybrid cloud backup is an approach combining local backup for fast backup and restore, along with off-site backup for protection against local disasters.[3]

Hybrid cloud backup works by storing data to local disk so that the backup can be captured at high speed, and then either the backup software or a D2D2C (Disk to Disk to Cloud) appliance encrypts and transmits data to a service provider. Recent backups are retained locally, to speed data recovery operations. There are a number of cloud storage appliances on the market that can be used as a backup target, including appliances from CTERA Networks, StorSimple and TwinStrata.[4]

Recent improvements in CPU availability allow increased use of software agents instead of hardware appliances for enterprise cloud backup.[5] The software-only approach can offer advantages including decreased complexity, simple scalability, significant cost savings and improved data recovery times.[6][7] Examples of no-appliance cloud backup providers include Intronis, Zetta.net and cloudHQ.[8]

Typical features

Encryption
Data should be encrypted before it is sent across the internet, and it should be stored in its encrypted state. Encryption should be at least 256 bits, and the user should have the option of using his own encryption key, which should never be sent to the server.
Network backup
A backup service supporting network backup can back up multiple computers, servers or Network Attached Storage appliances on a local area network from a single computer or device.
Continuous backup - Continuous Data Protection
Allows the service to back up continuously or on a predefined schedule. Both methods have advantages and disadvantages. Most backup services are schedule-based and perform backups at a predetermined time. Some services provide continuous data backups which are used by large financial institutions and large online retailers. However, there is typically a trade-off with performance and system resources.
File-by-File Restore
The ability for users to restore files themselves, without the assistance of a Service Provider by allowing the user select files by name and/or folder. Some services allow users to select files by searching for filenames and folder names, by dates, by file type, by backup set, and by tags.
Online access to files
Some services allow you to access backed-up files via a normal web browser. Many services do not provide this type of functionality.
Data compression
Data will typically be compressed with a lossless compression algorithm to minimize the amount of bandwidth used.
Differential data compression
A way to further minimize network traffic is to transfer only the binary data that has changed from one day to the next, similar to the open source file transfer service Rsync. More advanced online backup services use this method rather than transfer entire files.
Bandwidth usage
User-selectable option to use more or less bandwidth; it may be possible to set this to change at various times of day.
Off-Line Backup
Off-Line Backup allows along with and as part of the online backup solution to cover daily backups in time when network connection is down. At this time the remote backup software must perform backup onto a local media device like a tape drive, a disk or another server. The minute network connection is restored remote backup software will update the remote datacenter with the changes coming out of the off-line backup media .
Synchronization
Many services support data synchronization allowing users to keep a consistent library of all their files across many computers. The technology can help productivity and increase access to data.

Common features for business users

Bulk restore
A way to restore data from a portable storage device when a full restore over the Internet might take too long.
Centralized management console
Allows for an IT department or staff member to monitor backups for the user.
File retention policies
Many businesses require a flexible file retention policy that can be applied to an unlimited number of groups of files called "sets".
Fully managed services
Some services offer a higher level of support to businesses that might request immediate help, proactive monitoring, personal visits from their service provider, or telephone support.
Redundancy
Multiple copies of data backed up at different locations. This can be achieved by having two or more mirrored data centers, or by keeping a local copy of the latest version of backed up data on site with the business.
Regulatory compliance
Some businesses are required to comply with government regulations that govern privacy, disclosure, and legal discovery. A service provider that offers this type of service assists customers with proper compliance with and understanding of these laws.
Seed loading
Ability to send a first backup on a portable storage device rather than over the Internet when a user has large amounts of data that they need quickly backed up.
Server backup
Many businesses require backups of servers and the special databases that run on them, such as groupware, SQL, and directory services.
Versioning
Keeps multiple past versions of files to allow for rollback to or restoration from a specific point in time.

Cost factors

Online backup services are usually priced as a function of the following things:

  1. The total amount of data being backed up.
  2. The number of machines covered by the backup service.
  3. The maximum number of versions of each file that are kept.
  4. Data retention and archiving period options
  5. Managed backups vs. Unmanaged backups
  6. The level of service and features available

Some vendors limit the number of versions of a file that can be kept in the system. Some services omit this restriction and provide an unlimited number of versions. Add-on features (plug-ins), like the ability to back up currently open or locked files, are usually charged as an extra, but some services provide this built in.

Most remote backup services reduce the amount of data to be sent over the wire by only backing up changed files. This approach to backing up means that the customers total stored data is reduced. Reducing the amount of data sent and also stored can be further drastically reduced by only transmitting the changed data bits by binary or block level incremental backups. Solutions that transmit only these changed binary data bits do not waste bandwidth by transmitting the same file data over and over again if only small amounts change.

Advantages

Remote backup has advantages over traditional backup methods:

Disadvantages

Remote backup has some disadvantages over traditional backup methods:

Managed vs. unmanaged

Some services provide expert backup management services as part of the overall offering. These services typically include:

Scheduled vs. Manual Backup

There are 2 distinct types of backup modes, scheduled and manual.

See also

References

  1. ↑ Edwards, Paul and Sarah (1994). The Best Home Businesses For The 90s. G.P. Putnam's Sons. p. 112. ISBN 0874777844.
  2. ↑ Vendor Landscape Storyboard: Cloud Backup. InfoTech Research Group Research, July 2011. p. 4
  3. ↑ Taylor, Martin (May 2012). "Cloud backup options: Pure cloud vs hybrid cloud backup". computerweekly.com. TechTarget. Retrieved 3 September 2015.
  4. ↑ Boles, Jeff. Hybrid cloud backup: D2D2C emerging as a viable data backup strategy. SearchDataBackup, 2 May 2011
  5. ↑ Slack, Eric. "Does Cloud Backup Need An Appliance?" Storage Switzerland, 14 June 2012
  6. ↑ Whitehouse, Lauren. "The pros and cons of cloud backup technologies” SearchDataBackup, March 2009
  7. ↑ “Backup as a service FAQ” SearchSMBStorage, October 2008
  8. ↑ http://www.bestbackups.com/blog/4429/7-cloud-storage-managers-for-multiple-cloud-storage-services/
  9. ↑ Zaborszky, Peter. (2012-11-16) Are online backups worth it? How much are you paying per GB at home?. Best Backups.com. Retrieved on 2013-08-10.

External links

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