Passwords should never be stored in clear text, Excel or in the cloud. These are easy targets for viruses and hackers. There is a open source program called KeePass that will store your passwords in an encrypted file on your Mac or PC. A pin or password is used to access your data. You can also load this directly to your mobile device without it ever touching the cloud. KeePass will actually speed your access to web based accounts and help you maintain strong passwords.
Some of the key features or the program are: auto-type, hot key and drag & drop into your web browser; searching and sorting; strong random password generation; hard copy printing and export to 3rd party formats; backup of old data; a note field for storing additional account info.
For more information go to our KeePass instructions here