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* Configurable TLS (SSL) communications encryption between each component (storage, client and cloud)
* Computation of MD5 or SHA1 signatures of the file data, if configured
Data encryption should additionally be applied when you choose a public cloud service provider.
The same is important for the compression of backup data. The local backup cache is used to compress the data before sending it to the cloud in order to lower the network bandwidth load and improve backup speed. This becomes critical for enterprises which backup huge databases like [[Oracle Corporation|Oracle]] or [[Microsoft SQL Server|MS SQL]] or huge files like [[virtual machine]] images or mail server databases (EDB files of [[Microsoft Exchange Server|Exchange]]).
Recent improvements in CPU availability allow increased use of software agents instead of hardware appliances for enterprise cloud backup.<ref>Slack, Eric. "[http://www.storage-switzerland.com/articles/entries/2012/6/14_Does_Cloud_Backup_Need_An_Appliance.html Does Cloud Backup Need An Appliance?]" Storage Switzerland, 14 June 2012</ref> The software-only approach can offer advantages including decreased complexity, simple scalability, significant cost savings and improved data recovery times.<ref>Whitehouse, Lauren. "[http://searchdatabackup.techtarget.com/tip/The-pros-and-cons-of-cloud-backup-technologies The pros and cons of cloud backup technologies]” SearchDataBackup, March 2009</ref><ref>“[http://searchsmbstorage.techtarget.com/feature/Backup-as-a-service-FAQ Backup as a service FAQ]” SearchSMBStorage, October 2008</ref>
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;Server backup
:Many businesses require backups of servers and the special applications or databases that run on them, such as [[groupware]], SQL, ERP- or CRM-systems and [[directory service]]s. This requires not only regular file-based approach, but specific point-in-time backups and restores for databases.<ref>[http://www.backup-utility.com/res/backup-types.html Scheduled backups of SQL Server or SQL Server Express databases (without version limitation).].</ref>
;Versioning
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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.{{citation needed|date=April 2015}} 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. [[List of online backup services|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 ==
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== Scheduled vs. manual vs. event-based backup ==
There are three distinct types of backup modes: scheduled
* Scheduled Backup – data is backed up according to a fixed schedule.
* Manual Backup – backup of data is triggered by user input.
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