[Borgbackup] Question regarding "Size" versus actual filesize

[Thomas Gries]

My borgbackup (here the vorta display) shows (after recalculation)
/_sizes_/in the GB range, which do not correspond to the actual used
file size on disk (which is about ~440 GB).

Is there any explanation somewhere in the borg-documentation of what the
Größe/Size means - if there is no correspondence to the used disk space?
I am puzzled....
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