Carbon Copy Cloner backup way too slow


hi, i'm new here, first post. please advise if there's better place post etc.

i've got 2008 imac running lion, trying 210 gb (mostly photos on 320 gb drive) ccc little seagate usb portable external drive, i've done many times before no problem, time it's taking frickin' forever! it's taking 10 seconds copy hundredth of gb, 10 times slow compared ccc's figures on troubleshooting page. it's taken on 19 hours copy 67 gb. don't know significance of this, activity monitor shows cpu on 90% idle , disc activity has tall green spikes marching across little screen. i've made big change, switching adsl wimax, don't see why should affect backing up.

other thing can think of tried clean folder structure in lightroom 5 little bit. had folder called "pictures" inside folder called "pictures" , couldn't figure out how rename inside folder (when right-clicked on it, there no rename option), created new folder called "photos go here", moved 5000 photos internal "pictures" folder , trashed folder. ccc going through 5000 photos @ glacial pace though did move them 1 folder another. can't understand why cause problem.

appreciated!
 

i've had experience time machine, not ccc. have upgraded os? machine might indexing?

when upgraded mavericks, macbook took weeks index, , couldn't tm until finished. dreaded going yosemite, thinking have happening again. has been fine. ccc on mine, after initial backup, way faster time machine.

maybe reinstall ccc , start again?
 


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