I have just migrated all my data from my 2015 MacBook Pro to my new Macbook Pro M1. There is a folder on the new Macbook under Locations: Macintosh HD: Users : Deleted Users : steveparry I created an account on the new Macbook prior to the migration with this same username (steveparry) as my old Macbook to simplify the process. This folder 'Deleted Users' holds 3.5Gb of data including a folder called 'Pictures' with the Photos Library.photoslibrary file of1Gb ... Can/Should I just delete this as it appears to be what's stored in iCloud? I stopped using iCloud to store anything after I approached the 5Gb limit. I then used Google drive as it is free up to 15Gb.