While it's generally not recommended, IMO this one of scenario where brainwallet or having encrypted cloud backup may help you.

Geographic Diversity

If any single location has enough key material that a physical attacker could use it to steal funds, you have a single point of failure. You'll want to spread your backups across a variety of physically secure / hard to find locations so that it's unlikely that any single disaster or attacker will be able to cause a simultaneous loss from multiple locations.

However, you don't want to take this too far! While you want it to be unlikely for an attacker or some event to be able to compromise your seeds, you also need to be able to check them every once in a while to ensure that they have not been compromised. If you never check your backups then a patient attacker could spend years slowly compromising enough of them that they can reconstitute your keys and steal your funds without you realizing until it's too late.

While it's generally not recommended, IMO this one of scenario where brainwallet or having encrypted cloud backup may help you.

Geographic Diversity

If any single location has enough key material that a physical attacker could use it to steal funds, you have a single point of failure. You'll want to spread your backups across a variety of physically secure / hard to find locations so that it's unlikely that any single disaster or attacker will be able to cause a simultaneous loss from multiple locations.

However, you don't want to take this too far! While you want it to be unlikely for an attacker or some event to be able to compromise your seeds, you also need to be able to check them every once in a while to ensure that they have not been compromised. If you never check your backups then a patient attacker could spend years slowly compromising enough of them that they can reconstitute your keys and steal your funds without you realizing until it's too late.