I am wondering if it is possible to recover an old wallet from 2011-2013 without the key phrases. I believe I have the backup but I am not entirely sure. The folders/files I have are:
What do you mean by "
key phrases", your wallet's passphrase (
password)?
If you don't have it, you'll just waste your time syncing core since it will ask you the passphrase once you want to send the funds out.
Your only option is to bruteforce it but you need to at least have some password candidates or some parts of it.
If you mean the "
seed phrase" or "
mnemonic" or "
backup phrase", Bitcoin Core never supported seed phrase backup.