In a secure place, I use /root/pwd, I have lots of files with names like 2017-07.txt, 2018-11.txt. Each file is filled with entries like:
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somesite username password date notes, (if any) another site
and it generally pops up. I haven't been perfectly consistent over the years, some of these passwords date back to 2006. Sometimes I have to dig a little. When I have to reset a password it goes in there too, either edited into the original file or in a new file with the current month. When I clone the SD card that's a backup of course, and I tar them up and FTP to other machines sometimes.grep -i walmart *.txt
I have hundreds of these silly passwords, sometimes to sites I've never even bought anything from. They started out in one file, then another for some reason, but they all have a .txt extension so grep finds them. No special software at all.