I am holding Bitcoin and crypto on an online wallet, exchange, electrum.
If it's a smaller amount, then I can still understand that you use online wallets or crypto exchanges - although you should know that neither of these two methods is desirable as a storage method because you are always exposed to hacking or possible exit scam.
I cant say that I have divided holding identically, I just keep crypto where it appears. As I mostly hold, visit practically same internet recourses from day to day, I dont bother a lot about security of my funds. I just keep seed phrases and passwords far from devices like PC, laptop or tablet computer.
You should worry more though, because some others are certainly trying to find a way to steal what you have. It makes no sense to keep your passwords and seeds as far away as possible from the device you are using, especially if you have not protected them well. Storing backups in different locations makes sense, but only if those locations are secure - otherwise you only increase the risk of someone finding them, accidentally or intentionally.