Depends on what it’s worth to you.
But: yes! 

 I've stored them together 😁 

 Together, they make a killer marriage imo, embracing both in its infancy makes you a legend of something bigger than yourself.

I wouldn't throw away the secret keys out of the matrix.

That said, we are just humans in a vast galaxy and this is just technology you should enjoy as well as your time on earth. 

 No worries man. Both are safe and hidden😁.

I love Bitcoin and Nostr! I was quite early with Nostr, but not so early with Bitcoin..

Both helped me so much in so many ways.

Thanks for the motivating words! 

 Bitcoin is more valuable than my nostr profile but I definitely would like to protect my nsec better than I currently do 

 I protect both. But if i had to choose, i would save the seed phrase for sure😅 

 Lol no not yet 

 Yes. It's a bit harder because no way you can memorize it. I care about my Nostr keys. 

 I guess nearly no one will safe the Nsec like a Seephrase.
If i would do so i must now grab my hardware wallet / signer to sign this message. Who would do this? 

If you would lost your nsec a other person can steal your identity. But i think it´ll ne easier to get your identity back as it would be to get your sats back. You can just grab a new nsec and kind of rebuild your identity, but your sats will be gone forever. Or at least someone else will hold them.

But the technic is already existing:
https://shop.lnbits.com/product/remote-nostr-signing-device

And in the feature it may be neccesary for companys or politions.

But i think we´ll become a technic to do this with our phones. For example with our biometric functions. 

 I try to keep my nsec safe, just like my seed phrase. I know you can easily make another one, but at least people will know it's really you with the old account.

And i didn't know about this device. Will check it out! Thanks for responding 

 But isn´t it then like a hot wallet? 
I mean you use it on your pc or phone online.
But to be honest i don´t really have a deep knowledge of how nostr works in the background. But for example primal could see my nsec, or not?

You´re right because of the identity. But it would be way easier to proof that your old npub isn´t under your control anymore and your new npub is yours. I mean if you meet your friends in person you can just tell them that your nsec was stolen and didn´t belong to you anymore. It would still suck, but with bitcoin you couldn´t proof that the sats are yours if your seeds are stolen. So your sats will be gone forever.

And on the other hand you´ll use your seeds, or your hardware wallet maybe once a month or something like that, because you´ll use a second bitcoin layer for your daily use. On nostr even know i sync messages, don´t know, 20-30 times a day. In a few years i guess i´ll sign even way more. So it wouldn´t be useful to sign it with a hardware wallet every time.