It is true that full node wallets are quite safe and secure; however, if hackers get a remote access to your PC, they can access your wallet as well. In this respect, I consider Trezor hardware wallet the safest. Even if you always keep it connected to a PC (and you certainly should not do that), a transaction can only be performed after you push a hardware button.
As for accessing your funds in case www.trezor.io
is unavailable or even shut down — you will be able to access your funds any moment, if you remember your 12 or 24 secret words. Here is a list
of wallets, via which you will get your money in the event when Trezor is down or if its servers are unavailable.
I have tried these apps and they actually work:
- Copay (Linux, Windows, macOS, Android, iOS, Windows phone)
- Electrum (Linux, Windows, macOS, Android)
By the way, Trezor also allows you to create a 25th
word, which add to security (only in case if you don't store it with all the other keys).