Re: [Duplicity-talk] How does duplicity know file changes

[Kenneth Loafman]

Hi Tashrif,

duplicity looks at the date/time/size to determine if a file has changed since previous runs of backup.

It hashes the file via librsync into multiple hashes so it can tell what pieces changed in future runs.  If a file changes, then only the piece(s) that changed will be stored in an incremental backup.

...Thanks,

...Ken

 

On Mon, Feb 21, 2022 at 11:21 AM Tashrif via Duplicity-talk <duplicity-talk@nongnu.org> wrote:

Hi all,

I am new to duplicity. When I run `duply my_profile backup`, how do duply and duplicity know if a file has changed from the last backup time? I can imagine two things:

1. Hash of file content is calculated and compared

2. Hash/text of just the information from `ls -la file` is calculated and compared

Best,

Tashrif

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