Backup to NAS devices
NAS or Network Share access rights are defined by the service Log On As account of the accessing DataCenter Windows service(s) on each Backup Server node machine. If DataCenter's services are not set to run as a particular user then it is likely that reading that network path and performing backups will fail to a network based backup target device, as normally those paths are locked down for permissions, and also since it is not likely that the service that DataCenter installs by default as utilizes the "Local System" user in Windows, which normally as NAS in particular won't recognize as it is normally a Linux based system that doesn't know what the "Local System" account is, or if it is a Network Share you are attempting to utilize as a backup target then you will likely have to configure some of the DataCenter services to run as a particular user that has been added to your NAS or Network Share for full read/write (Full access) permissions. Please read the additional KB articles for a further explanation of how to set the services to run as a particular user and why it is likely needed for DataCenter 7 here, and for DataCenter 8 here, and for DataCenter 9 here.
Notice: There are two ways to set the required DataCenter services to run as a particular user that has full read/write access to a network share path, instead of the default user that the services are installed clean as which is always "Local System". The recommended and preferred method is to directly edit each backup server enabled node via Nodes Management, and use the "Configure service account" function to specify the user which will automatically set all of the required services to run as that user, or you can set the Log On As value manually by editing each of the services listed above on each backup server node manually via Windows Services (services.msc). It is always recommended that you first try to utilize the "Configure service account" function in Nodes Management, per each backup server enabled node that needs it, and if that does not work you can follow the above linked KB articles.
The exact DataCenter services that will need to be configured per each Backup Server enabled DataCenter node (the Command Server is always enabled as a backups server by default and you could have more than one backup server enabled node) that you will be creating a Disk Pool on that will require full rights access to the NAS or Network Share are:
Note: DataCenter versions prior to 8.x prefixed the service names with the word "NBK" in the service names.
NovaStor DC Backup Service (this service exists in all versions except for 8.x, versions 7.x (read about 7.x services here) and prior named it "NovaStor DC Backup Server Service", and in version 9.x it is named this way (read about 9.x services here), but DataCenter 8.x did not contain this service (read about 8.x services here)
NovaStor DC Hiserv
NovaStor DC Remote Command Executor
NovaStor DC VM Backup Server (this service does not exist in any version prior to DataCenter 8.x)
Then apply a user account to the service(s) Log On As setting which has local admin rights and read/write access to the NAS (Share). You can do this by directly editing each backup server enabled node via Nodes Management, and utilizing the "Configure service account" function there to specify the user which will then set all of the required services to run as that user, or you can set the Log On As value manually by editing each of the services listed above on each backup server node manually. That user will also need to be added to the Administrators group (whether that is a local administrators group or the domain administrators group) on each Backup Server machine that you need to set the services Log On As settings on.
The account can be a domain account (if the NAS is part of the domain) or a local account which is also configured on the NAS (share) with identical password. Make sure that this account on the Backup Server machine is added to the Administrators group.
To change the service account Log On As setting per service on each Backup Server node machine where you will be creating a Disk Pool that is configred for a NAS or Network Share, open the Services (start->run->services.msc) as an Administrator, navigate to the specific service, [right mouse]Properties, tab "Logon" and check "This account" and type the name of an account able to access the NAS properly as well as the password. Click [OK] and restart the service.
Then via the DC GUI (any version) you can to Storage Management and create a new Disk Pool, any type of Disk Pool is supported, so a regular pool in the case of versions prior to 9.x, otherwise known as an Agent pool starting in 9.x, or a GIR pool in the case of versions prior to 9.x, otherwise known as an Image pool in 9.x, and in the Backup Directory field you would specify the UNC (network) path of the Network Share that the services have permission to get to on the backup server node that you creating the Disk Pool on. Simply paste in the UNC (network) path manually there into that field and then if you press enter it should show the contents of the network share, then save the Disk Pool device.