Depends on how frequently you need to access those keys.

If it's for long-term storage only then I would consider keeping the keys in a password manager on an online machine to be an unnecessary risk. Keep the key offline, possibly even on a piece of paper (a piece of paper at home or at a friend's would be totally safe as long as nobody knows you have coins - and any eventual burglars wouldn't even know what the paper is for).

It's not clear what you're asking or why. I'd think about it the same way I'd think about storing passwords or anything else.