I have a 1TB external HD dedicated to TM. As it turns out, I am using much less space on this disk than I though so I could realistically split the disk, perhaps 50/50. If I use disk utility to repartition the disk, can that be done non destructively so the existing single TM partition remains unaffected? If not what would the recommended procedure be to retain my existing TM backups? I have plenty of space on my internal disk to copy the TM data there if I need to copy it off before reformatting. But will TM recognise the data if I copied it from one disk to an internal and back again?