Does Advanced Data Protection have be turned on for all my devices?
I have the latest macOS or iOS or iPad OS on four of my six devices. Two of them can't be updated to these latest releases because they are too old to accept them.
If I turn on Advanced Data Protection (ADP) on the four eligible devices, does that mean I won't have access to my iCloud contents on the two without it?
I plan to purchase latest versions of the two older ones during this next year. Do I have to wait until I have all six before I turn on ADP on any of them?
iMac 21.5″, macOS 12.6