My recommendation is to wait until backup software (BE) officially supports it.
In the meantime, please consider signing up for BE 21 BETA testing:
Please visit the below link and register in this program.
If you have any queries, please contact us at email@example.com.
Thanks for your reply,
but could you verify your recommendations before you post any information!
BE 21 doesn´t support SharePoint 2019 and it´s not planned from Veritas.
Veritas took about 3 years to support SharePoint 2016 GRT, how long should the customer wait for 2019?
Any other users here, that can recommend a Backup solution (other than BE)?
Feedback from BE Product Management:
What we can state is that we have SharePoint 2019 support in our backlog and are working on this item but it is not part of the current beta for the next release.
Not even supported by NetBackup yet.