More info about backups created by Borg Backup

Hi,

I am successfully using Borg Backup to backup to Borgbase.com.

In the results, I have e.g. :

INFO Collecting files to be backed up for nextcloud…
INFO Declaring files to be backed up…
INFO Backing up the MySQL database…
INFO Backup script completed for nextcloud. (YunoHost will then actually copy those files to the archive).
INFO Creating a backup archive from the collected files…
INFO The archive will contain about 1.5GB of data.
SUCCESS Backup created: auto_nextcloud
name: auto_nextcloud
results:
apps:
nextcloud: Success

However, I have this message everyday, with a lot of data, 1.5GB of data.

Does it mean I upload every day 1.5GB of data? Or just the new files I created?
I thought it was an incremental backup…

Thank you.

I don’t know how the app works in details, but this looks like standard Yunohost backup logs.
I guess it makes a standard backup then synchronise the resulting file (uncompressed archive by default) to the borg repository (in that case, Borgbase).

Borg splits file into chunks of a defined size, and will check for changes or addition for each chunk. So it’s likely that any new or edited data (in a particular chunk) is synchronized, but not chunks (~=archive parts) that didn’t change.
So the end result will be bigger than the “real” changes, as it will impact of whole chunk, but smaller than the archive size.
At least that’s my understanding of how it may work.

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