This is not a CDC specific message. The "AppDomain 347 ( <any managed code assembly) unloaded." indicates your system was under memory pressure and the managed code assembly was...
You may want to keep the CDC table on its own filegroup. This way you can decide if/when to backup the historical CDC table independent from your user tables.
You need to save th @to_lsn and use that as the new @from_lsn the next time you call the functions. This moves up the bottom water mark to automatically...
You can also "roll your own" two way Transactional Replication. Just setup up each SQL server as its own Publisher/Distributor and the other SQL Server as the Subscriber. ...