Each clone has its own data. You can use a separate account for each clone.
Keep your cloned apps apart by naming them however you'd like.
There are multiple ways to obtain APK files. One way is through third party websites such as ApkPure.
warning XAPK files are currently not supported.
No, only Android apps are currently supported.
App cloning is an experimental and complex process. As a result, cloned apps can malfunction due to various reasons. Sometimes using an older version of an app can help.