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Stuck/Failing Time Machine Backups

by sunier2 / October 14, 2009 4:02 AM PDT

White MacBook (about 4 months old) OSX 10.5.8, Using 115GB Iomega HDD (3x size of MacBookHD I'm backing up), tried diff. FireWire cables.
Shortly after purchase T.M. began giving a warning after 12-18 days that it hadn't backup up for that time. I ran Disk Warrior on both the internal and external drives. Run Permissions regularly. The Iomega works perfectly with T.M. on my old iMac and vice versa.

In T.M. Prefs it always says "Last Backup: Failed" and "Backing Up: 30.3MB of 30.6GB." It's been stuck at that for a week now! Yet the T.M.arrow-circle in the menu continues to revolve. Lately I get a mysterious warning: "The application PubSubAgent quite unexpectedly." Don't know if that's related. Otherwise no problems at all with MacBook, so I can't image doing an archive & re-install as AppleCare has advised! Also getting no help from other forums or Just Answers. Any ideas out there?

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Never had much success with Iomega drives, but
by mrmacfixit Forum moderator / October 14, 2009 9:20 AM PDT

I would try this first:

Format that external again as Mac OS Extended(journaled) and try again with the backup.

Alternatively, the purchase of another external drive, USB 2.0 is cheaper than Firewire, might be an option if you don't like the idea of an Archive and install


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Stuck/Failing Time Machine Backups
by sunier2 / October 15, 2009 2:56 AM PDT

Thanks. I did reformat with Mac journaled etc. a bit ago. I think you're right; I've begun looking at getting a 3rd external drive. The fact the the MacBook never stops saying "Indexing Iomega external drive" has probably convinced me. But it still bothers me that the Iomega worked perfectly with my old iMac on T.M.!
Surprised to read that USB2 connections are a bit faster than FireWire. I thought I should only get a Firewire 400 drive. Am I wrong?

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USB v Firewire
by mrmacfixit Forum moderator / October 15, 2009 7:45 AM PDT

Theoretically, USB has the faster speed, 480 v 400, but it consistently fails to reach anywhere near that speed in real life.
There are too many overhead issues and processor hits.

Firewire, on the other hand, can sustain a high transfer rate without processor hits.

I only mentioned USB because most of the major manufactures have moved away from Firewire, which tends to make them expensive.

I have a Seagate 1TB USB drive and have had no problems with it.


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