Use paper and pen to store seed phrases. We encourage you not to use any other digital materials.
If you think you might lose or damage that paper, make multiple copies.
Keep those copies in a separate location.
By having multiples copies, you can also enhance security level by using Shamir's Backup sheets.
These let you backup your seed phrase on paper, and require for instance 3 from 5 sheets to be able to recover.
Having only 1 or 2 sheets will not allow to have completely your seed phrase!
So, you can place the sheets in multiple place to improve security.
This number which is reasonable to keep in multiple locations could be 4 or 5. I personally moved 4 copies to different locations because if part of the house burns down or is damaged, the seed phrase can be retrieved from multiple locations.