I encypted some important files using Microsoft Encrypted File System, the encryption built into Windows, and backed up the EFS .pfx keyfile with a password and forgot about it.
Years later I reformatted Windows and lost access to the files. Normally not a problem, but I could not remember the keyfile password.
In the end I went through the Lastpass Security Challenge looking at old, reused passwords and found it. I hadn’t used the password in 5 years.
The constant advice we get is to encrypt our files, but I wonder if it’s worth the risk.