Google Drive:
1. Copy of file (ISO, EXE, MSI, ZIP, etc.)
2. Sheets: name, version, price, license key, website link, order date, order number
So like, I bought a copy of Malwarebytes Lifetime back in the day for my personal computer. They converted it from an ID/key to a regular license for the 3.0 upgrade. However, I have to install 2.0 first & lifetime-license it, then upgrade to 3.0 to have it grandfather in because apparently 3.0 doesn't have integrated lifetime as an option. So I keep copies of both installers in my gDrive, along with the licensing information. If I ever reinstall, I just grab the file from my personal cloud & copy/paste the license over. For stuff like Windows 7, I just make an ISO & keep a copy of the USB media install tool on my gDrive. The gmail account is separate from my normal account & is protected with 2FA via Google Authenticator, plus printed backup codes in my lockbox at home. Pretty simple & secure!