This subject has probably been beaten to death in older threads, so my intention is to ask for any new advice you may have relating to which one of these two apps, "Carbon Copy Cloner", versus "TimeMachine." I won't do a clean install this time since I only use my 2011 iMac for photo editing, keep it updated, and it runs flawlessly. I keep two different sets of backups on an external Seagate 4TB USB-3 hard drive, one using CCC and the other TM. I plan to migrate all the apps and files on the 1TB internal SSD in the old iMac to the new iMac. Cloning the internal SSD using CCC takes about 4 hours. I have successfully used CCC to clone a couple of Macs I have during the removal and replacement of the internal hard drives, but have no experience with TimeMachine. I would sincerely appreciate any advice you may have. The 2011 iMac is running under Mac OS High Sierra. Something else I forgot to ask: Would creating a new admin name and password on the new iMac, interfere with the admin's name and password on the older iMac?