Veeam Backup & Replication Documentation
Veeam Community Forums - NTFS cluster size recommendation

Veeam Forums - [KNOWN ISSUES] 7.0 : Issues, Patches and Hot Fixes
Veeam Forums - READ THIS FIRST : [FAQ] FREQUENTLY ASKED QUESTIONS v7
Veeam Forums - VMware : [FAQ] Frequently Asked Questions v7
Veeam Forums - READ THIS FIRST : [FAQ] FREQUENTLY ASKED QUESTIONS v6
Veeam Forums - >>> READ FIRST : [FAQ] FREQUENTLY ASKED QUESTIONS v5 <<<

How to Use the Veeam Backup Validator describes the use of Veeam.Backup.Validator.exe.

Veeam Forums - [ALL UPDATES] Known Issues and Fixes

Veeam Forums - [KNOWN ISSUES] 7.0 : Issues, Patches and Hot Fixes
Patch 4 Release Notes for Veeam Backup & Replication 7.0
Patch 3 Release Notes for Veeam Backup & Replication 7.0
Veeam Backup & Replication 7.0 R2 update

Veeam Forums - [KNOWN ISSUES] 6.5 : Known Issues, Patches and Hot fixes

virtuallyuncovered - Veeam Backup 6 and 6.5 Cannot complete login due to an incorrect user name or password
mitchellaneous - Veeam v6.5 (database issue)

Virtual to the Core - Veeam Backup and the maintenance of a Reverse Incremental Job
Virtual to the Core - Veeam backup methods and the impact on destination storage I/O

Virtual to the Core - Veeam backup repository on CentOS 7
Timo's Techie Corner - Veeam and Linux Repository

On CentOS 7 install perl-Data-Dumper:

yum install perl-Data-Dumper

Veeam Support Knowledgebase - KB1744 Tips for DAG Exchange Backup and Replication in vSphere
B4Z.CO.UK - Veeam Backup & Replication - Exchange 2010 DAG Issue

With the reversed incremental backup method it is not possible to run a restore/backup while a restore/backup is running.
Sources:
Veeam Forums - Restore while backup job running
v5 Choosing Backup Mode.xlsx
v6 Choosing Backup Mode.xlsx under Backup Method at Veeam Forums - READ THIS FIRST : [FAQ] FREQUENTLY ASKED QUESTIONS v6
v7 Choosing Backup Mode.xlsx at Backup Method at Veeam Forums - READ THIS FIRST : [FAQ] FREQUENTLY ASKED QUESTIONS v7

The BACKUP LOG step fails when using Veeam B&R to create a back-up of a VM running SQL Server 2012 and using databases with the Full recovery model.

Workaround is to grant NT AUTHORITY\SYSTEM sysadmin server role permissions on the SQL Server instance(s).

Source: Veeam KB - Log truncation issue on SQL 2012

Veeam Backup & Replication 8.0 update 3 (8.0.0.2084)

Full error message:

19-1-2016 8:03:31 Error    Publishing
19-1-2016 8:03:11          Backup point: created at 18-1-2016 23:45:39, type full
19-1-2016 8:03:32          Error: Failed to allocate unique FID.
                           --tr:Failed to create subfolder [VMNAME_GUID] of the folder  [/VeeamBackup_VEEAMSERVERNAME. FID: 41].
                           --tr:Failed to create folder. NFS share ID: [{GUID}]. Folder relative path: [VMNAME_GUID].
                           RPC: Failed CreateFolder.
                           Failed to allocate unique FID.
                           RPC: Failed CreateFolder.
                           
19-1-2016 8:03:32          Unpublishing
19-1-2016 8:03:32          Task finished

Solution: Restart the Veeam vPower NFS Service on the Veeam backup server hosting the vPower NFS repository.