I have a 24 inch early 2009 iMac that I just upgraded to Mountain Lion. Years ago I upgraded it to have 8 GB of memory. (Having 8 GB of memory greatly reduced the amount of times I get the little spinning color wheel.)
After I upgraded, I checked to see if I needed any further updates, did the updates, and my iMac is up to date with all updates.
Now that i have installed Mountain Lion, I wanted to create a new full backup. I have two Time Capsules and a LaCie 2 TB external drive. When I attempt backing up to any of these three devices, it takes a really long time. I have been backing up to a TC for over 9 hours as of this writing, and it has only backed up a bit less than 10 GB in that time. This was overnight, when nothing was going on on the iMac. I have tried backups to the other TC and the LaCie and aborted the backups after getting similarly slow times.
TM says it will be about 14 days before my backup is finished. Total backup size is 371.85 GB
Also, Spotlight says there is 3 days remaining before it will be finished indexing my computer.
I have run a verify disk in Disk Utility, and it says the disk is fine.
When I look at the bar graph running on Disk Activity on the Activity Monitor, the red line (data written) is pretty much a wavy flat line very close to the bottom of the little graph window, with spikes every 10 or so seconds. (I believe the data shown and the graph shows total Disk Activity for all disks that are mounted.) There are times when the Data written/sec just sits there at 0 or 4 KB/sec or some other really low number, then it will spike up to a number over, say, 1, 2 and once in a while over 20 MB/sec.
I have done large backups like this in the past that took overnight or the better part of a day or two, but never this slow.
Does anyone have any ideas what is wrong?