signal messages and calls cannot be accessed by us or other third parties because they are always end to end encrypted private and secure. signal messages pictures files and other contents are stored locally on your device. these contents are readable by the open source signal clients. because everything in signal is end to end encrypted the signal service does not have access to any of this data. there are several community developed open source utilities that are capable of parsing locally stored signal content. android users can also help us test a new backup feature that makes it possible to move your local signal data between devices signal settings chats and media chat backups.
you maintain ownership of your data.
combined quote text and tldr
You maintain ownership of your data
{'signal.org'}