That is true for lots of things.
Moreover I use one easy “default” password for all basic stuff, and its always the same known to my spouse and written down on paper.
At least my offsite backups are protected from prying eyes. Maybe uneeded for local backups, but doesn’t hurt to have.
10 years? Boy you are joung :)
I have encrypted files from w 20 years ago, and unencrypted files from 30 years ago.
And digitized stuff from analogic of 40 and 50 years ago.