I have windows 2008R2 with SQL 2008R2 and a database of 4.3Tb, I use CR successfully (for 2+ years now), I do the transfer on a LAN link in http mode.
For a transfer on a 1G LAN, you will have a transfer time of 60-72 hours. You must set in XCP-ng the time to kill the task for 72 hours minimum, in /etc/xapi.conf line 306 set: pending_task_timeout = 259200 # 3 days in seconds.
For a transfer on a 10Gb LAN you will have a transfer of 7-14 hours.
I don't use snapshot with memory but the recovery was ok, I had an event.