We are using Azure and the azure blobstore is not yet fully supported by the the fdbbackup client (and not supported by the K8s operator).
I’m wondering is there any major concerns with backuping up the db to a file system, we would have to use a networked file system (SMB/NFS) but could we run multiple agent at the same time ?
Using NFS should be fine and you can run multiple agents. The consideration is more about performance. IMHO, the backup rate during normal operations (continuous backup with incremental changes) should be fine. If you have a large DB, initial backup may have a higher rate.