Déjà Dup

backup details?: Block? Changed/new files only?

Asked by poikiloid

Many thanks for making an easy S3 backup option for ubuntu!!

Can you tell us more about how the backup works? I would like to know:

Does Deja Dup currently do, or have plans to add in the future:

1) Only upload new files and files that have changed (to minimize S3 cost), or does it send all the data every time?

and if it can do only new/changed:

2) is there Block writing of only changed part of large files (to minimize S3 costs)?

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Steven Danna
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Best Steven Danna (ssd7) said : 		#1

According to the project website, Deja Dup uses duplicity as its backend. According to the duplicity website the following is one of its features:

Bandwidth and space efficient: Duplicity uses the rsync algorithm so only the changed parts of files are sent to the archive when doing an incremental backup. For instance, if a long log file increases by just a few lines of text, a small diff will be sent to and saved in the archive. Other backup programs may save a complete copy of the file.

I hope this answers your question.

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poikiloid (efelthauser) said : 		#2

Thanks Steven Danna, that solved my question.