Backup Container on USB drive?

Cryptomator charges a license through in app purchase for android and ios. It could be great, but haven’t tried it. Droidfs is free and open source. Worked for both a local hidden volume, and usb with the above workaround. Don’t know how good gocryptfs or cryfs are. Gocryptfs had an audit in 2016 linked from their github, and cryfs was published for peer review in 2017. Droidfs, gocryptfs, and cryfs are still currently worked on, but droidfs hasn’t released in 2 years. Last release of gocryptfs was 1 year ago, and cryfs 2 years. The devs of all three are still committing regularly, so I’m not worried about this. There is EDS lite, a veracrypt app for android. But it was last updated 6 years ago, making it 5 years behind veracrypt itself. Couldn’t find an up to date open source app for veracrypt.