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"Can't Add That Much Data to Backup Set"

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I've been wrestling with this for weeks, to no avail. Every time I attempt a backup, I receive notice that the backup failed. Here is a typical report:


∆ Retrospect version 6.1.126

launched at 9/9/2008 6:24 PM


+ Executing Immediate Backup at 9/9/2008 6:47 PM

To backup set Backup Set A…


- 9/9/2008 6:47:50 PM: Copying Macintosh HD…

Can't add that much data to backup set.

The limit is 2.0 G.

9/9/2008 6:48:54 PM: Execution incomplete.

Remaining: 408347 files, 24.4 GB

Completed: 0 files, zero KB

Performance: 0.0 MB/minute

Duration: 00:01:04 (00:00:54 idle/loading/preparing)


Quit at 9/9/2008 6:49 PM


I'm running an iMac 1 GHz PowerPC G4, Mac OS 10.4.11. My backup is an external hard drive connected via USB. It has 229.85 GB available. I'm using Retrospect 6.1.126. What am I doing wrong?

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My backup is an external hard drive connected via USB


A Destination for backup in Retrospect is the Backup Set.

There are multiple Types of Backup Sets.

On Mac OS, only File Backup Sets and Removable Disk Backup Sets can be stored on hard drives.


- What Type of Backup Set are you using?


Check the formatting on the USB drive; if it is anything other then HFS+ you'll want to reformat it (using Disk Utility).



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You don't mention whether you followed Dave's advice to check the formatting of your USB drive. Based on the symptoms you report, it's likely that this is the problem.


Launch Disk Utility, highlight the volume name, and see what kind of formatting the volume has. If it doesn't include the words "Mac OS Extended," you will need to erase and reformat the drive. You can select the type of formatting from the drop-down menu at the "Erase" tab.


Before erasing the drive, you should, of course, copy over to your internal volume any files or folders you don't want to lose.

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