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[rdiff-backup-users] Backup of a backup

From: Greg Torrance
Subject: [rdiff-backup-users] Backup of a backup
Date: Sun, 01 Jun 2014 15:40:42 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.5.0

Hi all,

What I would like to do for backups is the following: Rather than plug an external drive into my machine every day, I would like to do daily rdiff-backups to local storage (since I have more than enough). Then, once a week, I would like to backup that backup to an external drive.

My original thought was to use rdiff-backup for the local backup, thereby allowing me to have incremental versions of files. And then, backp the rdiff-backup using to an external drive using, say, rsync.

The problem I have is the following: Since I don't trust that file timestamps will be sufficient to determine whether or not a file has changed (since I have some large files that are updated with NO timestamp change), I would have to use rsync in the mode that hashes/checksums each file on the source and destination. And since the destination is an external drive, it will be extremely time-consuming, as it means fully reading every file across slow USB (before even attempting any updates).

Do I understand correctly that rdiff-backup does hashes/checksums of every file?

And do I understand correctly that it stores this information in the meta data, such that JUST the meta data needs to be read back from an external drive, thereby greatly increasing backup speed?

If I am correct about the above assumptions, it seems that rdiff-backup might be a good option for both my local backup and the backup (of the local backup) to the external drive.

However, at this point I'm unsure if an rdiff-backup of an rdiff-backup is even possible. Is it? How will it handle the backup of the meta data? Will the files conflict?

A related question: Is there any way to have rdiff-backup create the meta data in a separate location from the actual files? It would seem that might be quite a useful option. Just curious.

[I am running 1.2.8 on a Linux Mint machine.]

I'd really appreciate any help or suggestions you can offer.


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