The strings entered by, or copied from, 1Password are ignored by Apple's ["auto-correction"] assistants, which seem to alter keyboard input only, including keystrokes from Keyboard Maestro.And make sure you get the upper-case/lower-case correct, and watch out, because this can be hijacked by Apple's automatic, default "features" (e.g. auto-capitalization).
Other data can be saved [by 1Password] with the password and other credentials, including questions and answers (which can be copied and pasted as needed). Backup of 1Password works internally and also works with Time Machine, Carbon Copy Cloner, etc. Multiple backups can occur if 1Password vaults are on more than one device.
(I don't get paid for these comments. They derive from half a decade of use of 1Password.)