What are some handy free backup apps from android to NAS?

Question

Android

I would like to be able to select folders and, when entering a wi-fi network, copy files to my home NAS.
Are there any such applications? Even if paid (without a subscription)

Answer 1

Branded applications from the NAS manufacturer itself. For example, Synology has them.

Answer 2

If you can plug in Nextcloud (Synology, for example) on a NAS, then there is a whole set of mobile applications (Nextcloud, Nextcloud Notes, Tasks, PhoneTrack, etc.) for it, moreover, opensource ones, and are presented in F-Droid.