Please keep in mind:
1. this has nothing to do with hashcat. If the password is completely random, long enough, wasn't leaked before and therefore doesn't appear in any word list, it could be just infeasible for any password cracker (if it is infeasible of course also depends on the hashing algorithm, password length, randomness etc)
2. a complex (yeah even a random) password can be cracked within a reasonable time if it already appears in some word lists (password-reuse etc)
3. sometimes passwords look weird/random, but actually are much more meaningful and related to the person who invented it (street numbers, initials, first letter of each word of a phrase etc)... They might also be crackable if you know the person who invented the password
etc
It's not always easy to say that "this password is crackable" and "this password is not crackable"... If you do not automatically generate them (e.g. by a password manager) they might follow a clear pattern and are crackable (but of course the algorithm behind iTunes backups is quite slow, therefore you must choose your password candidates very wisely)
1. this has nothing to do with hashcat. If the password is completely random, long enough, wasn't leaked before and therefore doesn't appear in any word list, it could be just infeasible for any password cracker (if it is infeasible of course also depends on the hashing algorithm, password length, randomness etc)
2. a complex (yeah even a random) password can be cracked within a reasonable time if it already appears in some word lists (password-reuse etc)
3. sometimes passwords look weird/random, but actually are much more meaningful and related to the person who invented it (street numbers, initials, first letter of each word of a phrase etc)... They might also be crackable if you know the person who invented the password
etc
It's not always easy to say that "this password is crackable" and "this password is not crackable"... If you do not automatically generate them (e.g. by a password manager) they might follow a clear pattern and are crackable (but of course the algorithm behind iTunes backups is quite slow, therefore you must choose your password candidates very wisely)