Filemo for Arq

Filemo makes it possible to access files backed up using Arq* (arqbackup.com) by integrating them into the native iOS Files app. It accesses the encrypted backup data by using an open source server component and decrypts the files locally on your device. The server component can be run on a free Heroku instance or hosted on your own server. Currently backups using direct file access (SFTP) or S3 (Amazon, Wasabi) are supported.
WARNING: Filemo does not currently support the newly released Arq version 6.
The setup requires some technical expertise, but the free version allows you to test if your setup works before committing.
More information on filemo.heap.ch
* Filemo is not affiliated, associated, authorized, endorsed by, or in any way officially connected with Haystack Software LLC, the maker of Arq. Both developers having the same first name is purely coincidental.