Storing Bank/Debit Info Multiple Accounts Safely

[Bethany Peysen]

Looking for advice based on personal experience for this situation:

I have a series llc. For each of my properties I have a separate bank account, checks, and a debit card. I started out keeping all of this information in an Excel spreadsheet on my laptop.  

However when I need to pay a bill or vendor and do not have my laptop, cannot access it right away, or am not home to view the debit cards that are filed away in my filing cabinet it becomes an issue. 

I would like to put it either in a google drive excel, a cloud based something, or on iCloud password app, but all of these are not secure. Any suggestions from your personal experience?