Deciding between Veeam and Acronis for VM backups

Sorry no contest Veeam

But trial them both and see what works for you

I concur with Andrew.

We went from StorageCraft ShadowProtect back in the day to Veeam because Veeam was the only product that gave us as good or better products and services. We've accomplished a number of recoveries that Veeam pulled through for without any issues. It just works. 

If the comparison was between veeam and altaro then you'd probably get a spirited discussion. but between Veeam and Acronis its Veeam without a question.

We've had Acronis before (albeit, quite some time ago) and moved to Veeam ~10 years ago, never regretted it. Not sure whether Acronis has something similar to Veeam's Instant Recovery, but given the size of your backups, you want to make sure you have that feature available ... RTO with VMs that size should be one of the main points on your list of features ... wouldn't want to wait 2-3 days for a VM restore in case a VM is corrupted or data was deleted.

Thank you all for your insights.
As Veeam is the established backup solution for many years now I was expecting those answers ;)
I think Veeam is great and I love it. But it lacks on some features Acronis enables gathered in one simple UI (backups VM (from HV, ESX, KVM and more), baremetal, workstations, o365, to local or offsite storages. At rest antivirus scans. Automated sandbox backup testing).

I'll test all of that and report here if it works as intended.

From what I know Acronis is lacking Instant Recovery feature. But it can be worked around by using replications.
If we loose our main storage, the replication will be spinned up with up to date data down to the 15 minutes.
If we loose our entire main office then we will start our offsite replication that is updated twice a day.

Concerning Altaro that we use too, it lacks one key feature that is much needed for our small clients with so slow internet connexion : if a VM is moved it is seen as a new VM and the backup start from scratch. It could take more that 4 days to upload a new offsite. We need to be able to match one VM with its old backup.

Acronis is interesting for us also because of the one portal where we can monitor all of our clients backups at a glance. As a service provider it makes sense.

Thank you again
Regards
Ben

Ben

service provider it makes sense.

That was a key piece of information which was missing from your OP.

Veeam was the second virtual machine backup solution, which many others try to copy.

You may want to consider N-Able and Cohesity if you are a service provider.

All of our clients are using Altaro except one that is on Veeam.
I think Acronis is way better than Altaro. But for that client on Veeam, it is less obvious.
This is why I focussed my OP on Veeam only ;)

I'll check on your suggestions.
Thank you