✨ [REQUEST] transmission, document where torrent files are stored

[bilogic]

Checked

• If a new addon, I have checked on Google that such as addon doesn't already exists
• If a new feature, I have searched in the discussions & issues that it was not already covered

Which addon?

I backed up transmission, but there are no torrent files in it

Is your feature request related to a problem? Please describe

I want to migrate over to qbittorrent, but without the torrent files, a migration is not possible

Describe the solution you'd like

Please make torrent files part of the backup

[bilogic]

I found them in HA's /config/addons_config/transmission, they should be included in HA's backup (but currently not)