Unfortunately safe deposit boxes aren't available everywhere - newly built banks often don't have them, and some banks that have them no longer accept new customers. --They're expensive to build and maintain, and they're seen as being in a somewhat grey area with regards to KYC laws.
Having a safe at home is an option, but it needs to be mounted properly to prevent a burglar from being able to simply carry it out and try and access later.
At the end of the day, your best bet is to keep instructions on accessing your data (minus the actual code that is needed) somewhere it can easily be found by your family, and make sure that one or more family members have copies of the code but don't know the full details of where to use it without those instructions.
Having a safe at home is an option, but it needs to be mounted properly to prevent a burglar from being able to simply carry it out and try and access later.
At the end of the day, your best bet is to keep instructions on accessing your data (minus the actual code that is needed) somewhere it can easily be found by your family, and make sure that one or more family members have copies of the code but don't know the full details of where to use it without those instructions.