Tuesday, 10 April 2018 09:54

ownCloud to add Delta Sync technology from next release


Germany-based open-source file syncing and sharing software company ownCloud has added a feature known as Delta Sync that reduces the sizes of files that have to be uploaded or downloaded after changes have been made.

Only the modified bits are downloaded or uploaded and significantly reduces the volume of data that is transmitted.

Delta Sync is in a testing phase and works for uncompressed formats. It is particularly useful for files that have been changed only slightly.

The feature is licensed on the server side under AGPLv3 and the client side under GPLv2, and can therefore be freely used and further developed by the community.

Delta Sync has been developed by members of the ownCloud community and will be available from the next major release onwards, the company said in a statement. That release is expected later this year.

Delta Sync supports the following file formats:

  • Crypto Container (e.g. VeraCrypt)
  • Disc images (.iso /.img)
  • Audio (raw audio formats /.wav /.aiff)
  • Images (.svg /.tiff /.bmp /.dng)
  • Video (raw video formats, e.g. uncompressed.avi)
  • Virtual Machine Images (.vdi /.ova /.img /RAW)
  • Microsoft PST Files (emails, calendar entries, etc.)
  • Text Files
  • Tar Archives

After the release, a testing phase will then begin, in which the community will be able to try out the feature and provide feedback.

This will be followed by stabilisation of the new sync algorithm and further testing, performance measurements and performance optimisation, until the feature is finally available to all ownCloud users.


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Sam Varghese

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Sam Varghese has been writing for iTWire since 2006, a year after the site came into existence. For nearly a decade thereafter, he wrote mostly about free and open source software, based on his own use of this genre of software. Since May 2016, he has been writing across many areas of technology. He has been a journalist for nearly 40 years in India (Indian Express and Deccan Herald), the UAE (Khaleej Times) and Australia (Daily Commercial News (now defunct) and The Age). His personal blog is titled Irregular Expression.



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