How do I determine change deltas for replication?

[electricd7]

Hello,

I am in my first run of Veeam's replication feature. I have a source environment which contains about 80 virtual machines which I back up nightly. I am attempting to replicate all 80 machines to the DR site via a 45Mbps WAN link which is also used for other business. I have properly seeded the replica site and am doing my first replication job pointed to the seeded VMs. Because of restore/seeding challenges, I am about 12 days behind from the time I restored to the DR site to today. I would like to know if there is a way to predict how much data I will be sending across the WAN link for each replication job (done by datastore)? I see a percentage for each job, but am not really sure how to correlate that to actual bytes. Thanks in advance!

ED7

[nefes]

If you have incremental backups set up for all this VMs, you can sum the size of all incremental files for that period, assuming there were no fulls between that dates.
Or just take average of incrementals and multiply by number of days.
Be aware, that is very rough estimation, since it assumes that every day data changes in different blocks.

[dellock6]

Also, backup uses compression and deduplication, so the size of incrementals is far less than size of replica, those cannot use any data reduction since they are going to be stored in native VMware format. A good number could probably be the "read" amount of data into the backup log, this number is pre-compression and pre-deduplication.

Luca.

[veremin]

via WAN link which is also used for other business

In this case it’s always advisable to have throttling rules applied, so that, bandwidth available for backup activity would be limited. Thanks.