Restore data between apps and across the same network

[CranberrySoup]

Describe your suggested feature

Users switch between stable and pre-release semi-regularly. Therefore they would greatly benefit from being able to instantly restore data from other CloudStream instances installed on the phone. This is possible to do securely and efficiently using various existing Android IPC methods.

In the future this could also be extended to other CloudStream installations on the same network.

This is of somewhat limited use, because backups exist, but it would streamline the experience a lot.

I was thinking of trying to implement this in the near future.

Other details

No response

Acknowledgements

• My suggestion is NOT about adding a new provider
• I have searched the existing issues and this is a new ticket, NOT a duplicate or related to another open issue.

[fire-light42]

This runs into the same-ish problems as sync. I think it would be very much appreciated if we solve the problems from #1641 (comment) with an internal API so everyone can use it.

[CranberrySoup]

Because the restore is user initiated I think it is fine to just use the existing backup and restore system as is.