Getting a new phone for the holidays doesn’t mean giving up Signal message history. Restore old messages on a new phone using Signal Secure Backups or device-to-device transfer.

https://support.signal.org/hc/en-us/articles/10074659364122-Backups-and-Device-Transfers-on-Signal

Backups and Device Transfers on Signal

Signal offers several secure options for backing up or transferring your messages, depending on your device and situation. Signal Secure Backups are an optional, secure backup solution that store y...

Signal Support
@signalapp
You should officially support third-party clients for greater decentralisation and so that it's easier for them to support all features including Signal Secure Backups.
@light @signalapp you can already connect third party clients. the Signal team even on occasion works with the Molly team on features.
@Yuvalne
Oh ok. That's good. I use Molly-FOSS myself.
Glad to see it's position (and that of other forks) is not as precarious as I feared.
@signalapp