A warning for anyone who is using local keychain: Don't. Either give in to iCloud keychain or use a different secrets manager.
If you're using a Mac with a T1 or T2 security coprocessor or Apple Silicon, your local keychain can only be decrypted with a key stored in those chips. Your backups are useless. I figured this out the hard way when an Apple depot repair for a failed display flex somehow ended up with my logic board getting replaced as well. After reimaging from backup (SSD was integrated on the logic board), the keychain was unreadable and I lost several accounts without recovery options. AppleCare's response was, well, you should have backed up your files, even though I had...
A fair warning, but I similarly lost a secret after transferring to a new iPhone, even while using 3rd party password manager. Said manager likely used secure enclave and thus failed to work on new phone. Failure was very quiet, not even an error or anything, it just stopped generating codes.
I was able to restore it through external means, but this reinforced “have a non-proprietary backups” for me.
If you're using a Mac with a T1 or T2 security coprocessor or Apple Silicon, your local keychain can only be decrypted with a key stored in those chips. Your backups are useless. I figured this out the hard way when an Apple depot repair for a failed display flex somehow ended up with my logic board getting replaced as well. After reimaging from backup (SSD was integrated on the logic board), the keychain was unreadable and I lost several accounts without recovery options. AppleCare's response was, well, you should have backed up your files, even though I had...