In backup terminology, delta differencing (delta backups) refers to an approach to backup only the blocks that have changed after the first full backup. The differences are recorded in files called deltas.
As you can see from the example on the right, delta backups involve examining the files using fixed-size blocks (usually 1MB in size) rather than examining the whole file to see if it’s changed.
With this, individual blocks data, rather than the whole file itself, can be sent to the backup target. This appoach requires more computational power but requires less time and Internet bandwidth — usually where the bottlenecks are in modern-day computing.
Because only changed blocks are backed up, it is possible to perform much more frequent backup cycles without consuming vast quantities of Internet bandwidth. Backing up an entire 100GB server can (after the first full initial backup) be achieved in just a few hours each time the backup cycle is requested – much less if the changes on the server are minimal.
As an incremental/delta approach reduces duplicated data it can also help a storage administrator to reduce the cost of the backup destination, as only changed and deleted blocks are stored – the deleted blocks are then later removed from the storage platform as part of the retention policy.
Kamazoy use delta differencing technology across all of its backup products. This means, for you, that backups take less time to complete, and free up your computer more quickly than backing up the whole file each time. Also, if you are on a pay-per-byte connection, such as a mobile phone or hotel wifi connection, a backup will cost you significantly less money when using these types of connections.
In an enterprise environment, delta differencing means your files are locked for backup for shorter times, database backups take less time, and maintenance windows are significantly reduced. In addition, because only changed blocks are stored, this saves storage space on the back-end, and permits a greater amount of file revisions and restore options without storing copies of each and every file, like a traditional tape backup system would.
- Faster backups
- Smaller backup windows
- More efficient use of technology
- Uses less storage at the back-end, saving you money