repeating my answer from another thread...
I just spent 5 hours today transferring 400+ GB worth of Scrapbook pages, bundles and kits from my old 1 TB HDD to my new 2TB EHD.
It took 5 hours!! My PC is very old. As in 11 years old!! (Purchased in 2011 with Windows 7 - currently upgraded to Windows 10)
Fortunately I am in the process of purchasing new PC Parts so that my son can build me a new PC!!
Once my new PC is built, up & running, I plan to transfer the entire 400+ GB of Scrapbooking stuff, back to the new HDD which has 8 TB of Storage!!!
That should enable me to keep all my bundles, kits, elements and pages all in one place for the next 10 years at least!!