It is already possible to add multiple locations.
Just put alias to your EyeTV Archive folder which points to your new location and then restart EyeTV.
Now EyeTV sees all recordings in this new location too.
Are there any Linux apps which records TV from Elgato USB sticks? Then user can move videos to Mac and watch in Mac using EyeTV or QuickTimePlayer.
Any webpage or site which lists this type of apps?