VM replica with Exchange 2013

Hello,

I would like to build a Disaster-Recovery solution for an Exchange 2013 server.

I don't need H-A, or true clustering, I can tolerate a downtime of 30 minutes, a data loss of max 15 minutes and an automated failover is not mandatory (but it is desirable).

The budget should be limited to 10K EUR.

I'm thinking about using 2 physical servers (P1 and P2), each having its own internal SATA disks, and running W2012 standard; on 1 site.
On P1, I create 2 VM : Exchange server (EXCH-SRV) and application server (APPL-SRV)
On P2, I would like to create 2 identical VM, and use them as failover of the VM of P1

Questions :

2) If it is possible, my main concern is the Exchange DB consistency :would it be possible to restart Exchange on P2 after a crash of P1 ?
3) And, would this allow to have an automated failover (invisible for users) from P1 to P2 when P1 is down ?
4) Do I need specific additional components (NIC, specific licenses...) ?

I have already found many posts about the use of VM replica between servers using internal disks.

However, I have not foundinformation about the integrity ofExchange files.  I must be SURE about the consistency of the Exchange DB on P2.

Thanks in advance for your answers.