Inquiries about bareos incremental backup logic

[신정우]

hello, 

We are conducting backup through bareos open source

When an incremental task is executed, the actual modified data is only a few, but the incremental backup performs a backup of the entire data.

I want to know what criteria the modified data is recognized when executing incremental backups to solve this problem.

please reply!

thank you

[Brock Palen]

Shouldn’t happen,

What’s the backup host and can you include the job configuration here?
Mostly it works out of the box and uses filesystem metadata to determine if a file needs to backed up again. This can be modified but I don’t recommend it.

It’s possible if the filesystem being backed up has some metadata features like mtime/atime disabled? Or the time on the machines is out of whack (not sure how much that maters)

I have seen some odd behavior backing up dropbox/gdrive etc over rclone fuse but that’s expected those are not ‘real’ filesystems.


Brock Palen
bro...@mlds-networks.com
www.mlds-networks.com
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[Andrew Feldmann]

Since the original inquiry didn't specifically mention files, I'm
wondering if the expectation that only changed data within a file would
be backed up.

The incremental backup will backup all files (in their entirety) that
have some changed data.

The backup process is at the file level unless using a plugin of some
sort for something like a database, etc.

I hope that helps.

Thanks,

Andrew Feldmann