Backup Container on USB drive?

Droidfs on android, compatible with gocryptfs on linux. Claims to just be an encrypted overlay, but includes file viewers. Latest release is 2024, but the author is still pushing commits. For usb, theres a bug and a workaround until its fixed: Path issue in OTG USB drive (gocryptfs volume) · Issue #385 · hardcore-sushi/DroidFS · GitHub Theres one comment saying it doesn’t work on grapheneos. I’ve been using it on gos. If you are too, whatever it is may or may not affect your phone.