3 or 4 backups are definitely better than one, but when you already have a backup on two usb sticks, maybe your smartphone isn't the best choice for another backup, even if that file is encrypted, you need to consider everything posted by @ o_e_l_e_o.

Remembering your seed may be interesting as a challenge, but be careful not to reveal your secret at a time when you are unaware of what you are saying. Of course I don’t imply that you consume alcohol or drugs, but keep that in mind if it ever occurs to you to relax a bit in the company of friends or acquaintances some of whom may have bad intentions