As the amount of call recordings on my phone has grown to nearly 100GB due to various requirements, such as phone calls, WeChat calls, and QQ voice recordings, I have been storing them locally on my phone. However, my phone's storage space has become insufficient lately, which led me to look for a way to back up these files. Given the importance of privacy, I intend to store them on my NAS, without backing them up to any third-party platforms. My current solution involves using Syncthing to synchronize the files to my NAS, but it lacks a user-friendly interface and manual intervention is required for each backup. Therefore, I am seeking better solutions from V friends.