Consolidating 2 Apple accounts

cheers for your answer Dan,

after actually making a start on this nightmare task i have managed to break down my explanation a bit better.

forget the two apple accounts now, on the old account he isnt using icloud or purchased anything with it. so i am just removing it from the equation.

to be safe i have manually backed up over 700GB of his data to our back up drives.

i have the customers iMac with 700GB of data on.

customer has a new apple id and icloud account that was setup on a new phone just before Christmas last year.

if i add the new apple account to the iMac with the data on will it offer to merge the data on the iMac with the data already stored in the icloud from his phone.

will they have to use the smart storage feature as the iCloud data footprint will now be bigger than the total phone storage.

are there any things you can foresee been an issue ?

@chuxsta - OK then we are not talking about iCloud at all! We are then talking about the given systems log-in which is only for it and/or the email account which maybe different. Please clarify

To begin with it was two icloud accounts, it wasnt until i started digging into what he has and needs doing that it became apparent he only really uses one of them.

would it be best to make a new user account on the iMac and sign in with his new details then transfer his data from the old user account?

Here's a bit more on multiple iCloud accounts on the same system Syncing multiple iCloud data with a family Mac

Before doing anything I would make a full TimeMchine backup just in case!