I read that one of the best ways to preserve a seed phrase is to write it on a piece of paper and keep it in a safe place... Somewhere safe could be in your home out of the reach of family members and friends, it could also be a safe deposit box. But not everyone are financially buoyant to afford the services of a deposit box.
I believe we must have seen or heard about fire outbreaks, where buildings are completely erased by fire. Imagine if the owner or occupant of such a building has some Bitcoin assets, and has his/her phone, tablet, laptop and the seed phrase piece of paper in the building and everything was lost to fire. Now, this brings me to the question... Can seed phrase be memorized? It's advisable to memorize seed phrase?
The best method someone can preserve a seed phrase is through documents and the documents should be offline, because the offline documents is something we shall consider to say your coin will not be stolen from anyone, the best way is to have a box where you will have your documents that comprised your seed phrase, before some people use to keep it online and when they email is being hacked the wallet can be accessed, so that's the reason why people do not keep the seed phrase online