I'd recommend encrypted archives. Like using 7z/7zip to encrypt files.
this post was submitted on 30 Jun 2023
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Veracrypt
Yes highly recommend Veracrypt.
I use gocryptfs, i like having both CLI for scripts and its got GUI built into KDE Plasma's Vault feature
Zip the file(s), then GPG symmetric encryption/decryption with AES. Nothing fancy.
I personally use Cryptomator, which does on-the-fly data encryption/decryption, allowing you to mount the encrypted data as a "drive" which from the user's perspective looks like any other data drive.