Synchronize files between computers in a cluster

I need to synchronize the directory between multiple computers, and it can be two computers, and maybe more.

Files can be written to this directory on any of them and for some time these files should be placed on others.

Well, as an example, there is a cluster of several web or application servers and the user does an upload to the file. If the same user logs on to the site from another computer in 5 minutes and another server from the cluster gives him a load balancer, he should still see the file he downloaded.
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How can I do that?

I looked at a simple NFS - but it turns out there is a single point of failure - the computer on which this disk is native
I looked at xtreemeFS - but I just can’t configure it to work with replication

What other solutions are there?

thank