Re: FW: Update Catalogue file from diff files.

Hi Stefan,

I finally got around to testing that – and was really helpful, thank you very much.

Regards,

Dan.

From: Stefan Hammerl via Dar-support <[email protected]>
Sent: Tuesday, 19 January 2021 3:40 AM
To: need help compiling or using dar ? This mailing list is for you. <[email protected]>
Cc: Stefan Hammerl <[email protected]>
Subject: Re: [Dar-support] FW: Update Catalogue file from diff files.

Hi Dan,

do you know the merge-command?

In your case you could either merge to subsequent incremental archives or merge the incremental archive with the baseline:
dar --merge <output_archive> -A <diff_file_or_base> -@ <next_diff_file> --overwrite-policy "{-I}[Oo][Rr]" --no-warn

The overwriting policy is used to also delete files in the base archive (<diff_file_or_base>) when they are marked as deleted in the next_diff_file. Read the man page for details.

If a new archive is created you can delete diff_file and next_diff_file and probably rename output_archive properly.

Best regards,
Stefan
Daniel Cox <[email protected]<mailto:[email protected]>> schrieb am Mo., 18. Jan. 2021, 05:43:
Sorry first attempt to send had formatting issues:

Hi everyone,

This is my first post so I hope I am doing it right...

I am using DAR to create a mirror of data from one data store to another. I only ever need to send the latest diff files across the network to the second store and because of this I have decided to use a catalogue and differential backups on the source. I want to minimise the space that DAR uses on the source system. My process is like this:

1. Take baseline backup of whole system

2. Generate catalogue file from baseline backup (then delete baseline backup)

3. Generate first differential backup from catalogue and source

        dar -c <diff-backup-name> -A <catalogue> -R <source>

4. Generate subsequent backups from differential files

        dar -c <diff-backup-name> -A <previous-diff-file> -R <source>

The issue is that the number of diff files that I need to retain on the source system seems to increase quite quickly.

My questions are:
1. Can I somehow add the meta data in the diff backups that are generated back to the catalogue so that I don't have to keep the relatively heavy diff files around?
2. Is what I am doing the right thing or perhaps there's an easier way?

Thanks a bunch!

Dan.


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