Is there a solution for Time Machine error?

Question

I got an error in Time Machine saying backup had failed, a couple of days ago. Spent the next day or two trawling the web and found thousands of postings from people with the same error, but no solution.
(At least, some people had a solution - they were using PC-formatted hard drives.)
I've been using Time Machine for a few weeks, and it has only now taken a dislike to my external hard drive, which is connected by FireWire.
Is there a solution to this problem, or should I revert to using SuperDuper, which I was using successfully before?
I haven't put in lots of information about the apps I'm running, because this is a general query rather than a specific one. If there's a solution, I'll use it; otherwise I'll wipe the drive and go back to using SuperDuper.

Answer 1

OisinOg wrote:
Pondini - Thank you for your slightly hostile reply.
On the contrary. The statement was: +"found thousands of postings from people with the same error, but no solution."+ I don't know where you found thousands of posts -- there are many here, but certainly not thousands. If you're talking about, say, a Google search, if you actually look at them, many are duplicates, unrelated to your problem, or unrelated to Macs at all -- and there are a number of solutions that seem to have fixed many of the real ones.
The error message was the standard one: "Time Machine Error - Unable to complete backup. An error occurred while creating the backup directory."
There's most likely another, better message in your logs. Thus the suggestion about Time Machine Buddy. You can also use the Console app (in your Applications/Utilities folder). Click on Show Log List, then navigate in the sidebar to your system.log (or system.log.0.bz2, etc. for previous ones). You can filter for backupd to get the same TM messages as the widget, but I prefer to view the full log at the date/time in question, as messages from other concurrent processes may have a clue.
I've gone through the suggestions in some of the helpful replies to those thousands of postings, by wiping my drive, erasing it and reformatting it, first in two partitions using the GUID method in Disk Utility, then in a single partition. But Time Machine still doesn't want to back up to it.
Sounds a bit like a problem communicating with the drive. The logs may clarify that.
The hard drive of my computer is 250GB; the external drive is 300GB. Both are SATA drives; the external is connected by FireWire.
How full are they?
Thanks for your suggestion of downloading the Time Machine Buddy widget; I'll give it a last try tonight.
What is the difference between a SuperDuper clone and a Time Machine backup?
The initial backup of both copies almost everything on your HD, excluding only some caches, temp files, etc., although you can exclude other things. This takes quite a while, of course. Thereafter, only the items that changed are backed-up.
SuperDuper (and CarbonCopyCloner, which I use, and other, similar apps) are most often used to make bootable "clones" identical copies of your HD -- if your HD fails, you can boot and run from them immediately. With TM, once your HD is repaired/replaced, you restore your system to it from your TM backup.
Score one for the clones, but TM has it's advantages, too (which is why many of us run both).
First is, CCC and SD look at every file and folder on your HD to see what changed. This is quite time-consuming and CPU-intensive, so most of us run it once a day (or less often), usually automatically at, say, 3 am. TM, however, runs hourly, but uses an internal File System Event Log of changes, so it is far quicker and less intrusive. There are exceptions, but most users rarely even notice the backups unless they see the icon revolving. On my small system, for example, TM rarely runs over 30 seconds; CCC is at least 15 minutes.
Second, not only does TM keep previous versions of changed files, but it manages the space and backups for you. It keeps those hourly backups for 24 hours; except the first of the day becomes a daily backup which is kept for a month; one per week becomes a weekly backup that is kept for as long as there's space (it will fill the drive/partition). But it's smart enough, as it deletes the old weeklies, that it won't delete it's copy of anything that still exists on your HD.
There isn't room to have two 250GB sections on a 300GB drive. I suppose I could get another 250GB drive - I have an IDE enclosure somewhere - but I don't fancy the expense right now.
Your CCC or SD partition only needs to be as large as your HD, although in a pinch it only needs to be somewhat larger than what's actually used on your HD. If you don't have room for both on the one drive, an even better solution might be to get a pair of smaller portable HDs for CCC/SD. Use one daily for, say, a week, then take it to your safe deposit box, workplace, relative's house, etc. and start with the other. Now you're also protected against fire, flood, theft, direct lightning strike on your power lines, etc.