My MacBook Mid 2015 ver. 12.6.2 and my other devices iPhone 13 and iPad Pro are iOS 16.1

Hey ralee2511,

That's a great question, and what we found we placed below for you, linking the article associated with the information. It looks like your Mac would be limited on what it has access to if you switch over to the Advanced Data Encryption for iCloud.

Found within the article iCloud data security overview is the below information. You can click the link for more details.

If you enable Advanced Data Protection and then lose access to your account, Apple will not have the encryption keys to help you recover it — you’ll need to use your device passcode or password, a recovery contact, or a personal recovery key. Because the majority of your iCloud data will be protected by end-to-end encryption, you’ll be guided to set up at least one recovery contact or recovery key before you turn on Advanced Data Protection. You must also update all your Apple devices to a software version that supports this feature.

Encryption of certain metadata and usage information

Some metadata and usage information stored in iCloud remains under standard data protection, even when Advanced Data Protection is enabled. For example, dates and times when a file or object was modified are used to sort your information, and checksums of file and photo data are used to help Apple de-duplicate and optimize your iCloud and device storage — all without having access to the files and photos themselves. Representative examples are provided in the table below.

This metadata is always encrypted, but the encryption keys are still stored by Apple. As we continue to strengthen security protections for all users, Apple is committed to ensuring more data, including this kind of metadata, is end-to-end encrypted when Advanced Data Protection is enabled.

Be sure to take a look at the chart found in the article.

Let us know if you have further questions.

Take care!