At last i have one fundamental question:

How does bareos-fd know that these particular files have changed since the last incremental backup and must include them in the next one? Incremental backups are very fast because the incremental backup only includes changed files.
Bareos checks the timestamps of the files to determine if they have changed 
since the last backup.

With Accurate backup, it compares the list of files that have been backed up in the previous backups and compares the name and optionally other properties of the files to determine whether the files have changed or not.

Please read the docs for more details

https://docs.bareos.org/Configuration/Director.html#config-Dir_Job_Level

https://docs.bareos.org/Configuration/Director.html#config-Dir_Job_Accurate
https://docs.bareos.org/Configuration/Director.html#config-Dir_Fileset_Include_Options_Accurate


To include one file in an incremental backup, bareos-fd does not check every file, this would take too long with a large number of files. So how does bareos-fd know which files to include?

I.Piasecki




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