FTA, "At the end of it all, I will have documentation on financial accounts, password, etc."
It sounds like you are documenting sensitive company or client information. As such it is beyond the scope of you as an individual to place any of this information in a private store. You need some sort of formal business procedure for this. One place I worked THE COMPANY had safety deposit boxes. At another we would put emergency back up passwords in an envelope and give them to the administrative assistant who would keep them under lock and key in case I and/or others were killed e.g. on vacation. The company owners and managers knew about it and it was part of our policy.
If you are removing sensitive information from a company network and storing it somewhere in you personal control, you are looking for trouble. If there is a breach you could be personally liable either civilly or criminally. Do I what I did and make sure that there is a documented policy and attendant procedures, and follow them.