I’ve been looking around to find a good, privacy respecting way to sync my messages between phones. I decided I’m going to use SyncThing so I don’t have to mess around with a server. The only problem with this is that I haven’t been able to find any apps that work on modern Android that routinely backup and import messages from a file/folder into the messages database. Does anyone know any app that might do this?
I’ve used SMS Backup & Restore for several years to do exactly what you describe.
Everything backs up to a local folder on my phone and I sync to my home server. The app can sync backups to a cloud storage, but it isn’t required.
There’s even an OSS tool for converting it all to Excel now.
Its on Github, let me look for it.
SMS Backup & Restore has been my go to since about 2010, across 5 phones.