You will use iCloud!!

I finally took the plunge and replaced my old iMac (2011) with the MacBook

Air M3. I have not copied any data/information across from my iMac. I simply flashed up

the MacBook and leapt on it. Yes, things have changed in 13 years! What I cannot gt my head around is

I keep getting the message that "some iCloud data is not Syncing". I have never used the iCloud facility on my iMac and have not intentionally selected it on my MacBook. So having gone into SETTINGS and proceeded to turn off the iCloud sections, which I had not set anyway. On turning off the iCloud Drive setting I was given the message that I would lose all the files on iCloud and wouldn't get them back! I have no idea what files these are as I have only had MacBook a few weeks and have not created any new files yet, as far as I know!

Could it be that some of my data files from my iMac were surreptitiously synced on to iCloud?