Disaster Recovery & Backup

Veeam is a good solution for vmware: https://www.veeam.com/vm-backup-recovery-replication-software.html?ad=menu-products
For virtual environments you use agentless backup approach where the tasks are done on API level by host.

-->1. what 3rd party tools can be used with
I use Veeam Backup and Replication which works really great.

-->2. how licensing work in DR case. windows server, exchange, SQL etc
Veeam  you dont need additional license.

-->3. what are the best backup practise? weekly, monthly etc ? kindly explain those practises
Daily onsite, Weekly offsite, I keep a monthly  backup copy in External HDD (8TB) and keep in locker.

hi,
when on premise fails and DR become active. can we use the same windows license on DR site ? ( SQL, exchange, windoes server etc ?)

if SQL is configured in cluster mode. how does that work in DR scenerio ?

i have taken cloud hosting space from my SP. i want to use that for DR.

veeam (more complete) or altaro (altaro is easier)

as far as licensing is concerned it can get complex in a hurry. Basically each host server needs to be licensed. It is up to you to decide how much loss is acceptable.and how much resources you have. (RPO) and how long you can be offline (RTO)

Having a 0 RPO is a very expensive proposition.  Every write on storage array 1 has to be mirrored on storage array2.. only for the most critical of operations would I even consider this.. i.e. SQL Server Always ON solutions. Only a small part of the data is mission critical. Almost everything else within the 15 minutes of async replication is usually sufficient.
Backup stores a point in time.. it is like time literally stopped.
Replication depends upon the replication frequency and the latency involved.
Replication will not help to mitigate a ransomware attack, a backup will.. Replication will not help if a fumble fingered user deletes a file. Shadow copies and backups will allow you to recover the file.
Everything comes at a cost.

hi,

only for the most critical of operations would I even consider this..

Well, this happen, I have some customers working in healthcare who need that.. Or oftenly others, which consider there businness (part, or all!) very critical
There is a cost , sure
But Veeam too has a cost, and the more marketshares they have taken the more their prices has climbed..
In fact there could be a performance cost too, but mostly if it is not well designed and configured : with synchronous storage replication between arrays, the process is not the same comparing to asynchronous :
1 the production host requires a write
2 the production array make the write
3 the write is replicated to the DR array
4 the DR array send an ack to the prod array
5 the prod array send the ack to the host

So if there is a slow link or misconfigured synchronous replication to the DR, it can make your production slower

Replication will not help to mitigate a ransomware attack, a backup will.. Replication will not help if a fumble fingered user deletes a file

+1
absolutely right !
I think it is best to consider first having a good backup solution
then if you still have money you make replication
But this is only my opinion..