Backup all accounts

[laleeroy]

Can you add a feature where we can backup the accounts and just restore it.
I think that will be useful for switchfing to different Jellyfin server.

I have encounter problems before migrating from docker jellyfin to native linux application of jellyfin.
If only we have backup and restore, then I can just setup a fresh install on Jellyfin and the accounts with their expiration date will just be created once restored

[hrfee]

maybe in the future, but given the little time I have to work on this project i'm not sure.