[DOC-12885]: System resource requirements page does not list exception for higher Backup Service requirements

Updated the pre-installation requirements to include disk space specifications. Clarified that only block-based storage is supported, and network file systems such as CIFS and NFS are not compatible.

Update hardware requirements and add backup node specs

Clarified CPU descriptions by adjusting hyphenation for consistency. Added a new section specifying higher resource requirements for nodes administering backups, including updated CPU and RAM recommendations.

Author: RayOffiah

Diff for: modules/install/pages/pre-install.adoc

@@ -14,8 +14,8 @@ x86 Processors::
 | | Minimum Specifications* | Recommended Specifications**
 
 | *CPU*
-| 2 GHz dual core x86_64 CPU supporting SSE4.2
-| 3 GHz quad core x86_64 CPU supporting SSE4.2 and above
+| 2 GHz dual-core x86_64 CPU supporting SSE4.2
+| 3 GHz quad-core x86_64 CPU supporting SSE4.2 and above
 
 3 GHz six core x86_64 CPU supporting SSE4.2 when using Cross Datacenter Replication (XDCR) and Views
 
@@ -31,6 +31,31 @@ Network file systems such as CIFS and NFS are not supported.
 a|
 16 GB and above (block-based; HDD, SSD, EBS, iSCSI)
 
+Network file systems such as CIFS and NFS are not supported.
+
+3+a| 
+[IMPORTANT]
+.Backup Nodes
+=====
+If the node is used for administering backups, then be aware that the resource requirements will be higher:
+=====
+
+| *CPU*
+| 2 GHz quad-core x86_64 CPU supporting SSE4.2
+| 3 GHz sixteen-core x86_64 CPU supporting SSE4.2 and above
+
+| *RAM*
+| 8 GiB (physical)
+| 16 GB (physical) and above
+
+| *Storage (disk space)*
+a|
+8 GB (block-based; HDD, SSD, EBS, iSCSI)
+
+Network file systems such as CIFS and NFS are not supported.
+a|
+16 GB and above (block-based; HDD, SSD, EBS, iSCSI)
+
 Network file systems such as CIFS and NFS are not supported.
 |===
 --
@@ -58,6 +83,31 @@ Network file systems such as CIFS and NFS are not supported.
 a|
 16 GB and above (block-based; HDD, SSD, EBS, iSCSI)
 
+Network file systems such as CIFS and NFS are not supported.
+
+3+a| 
+[IMPORTANT]
+.Backup Nodes
+=====
+If the node is used for administering backups, then be aware that the resource requirements will be higher:
+=====
+
+| *CPU*
+| 2 GHz quad-core x86_64 CPU supporting SSE4.2
+| 3 GHz sixteen-core x86_64 CPU supporting SSE4.2 and above
+
+| *RAM*
+| 8 GiB (physical)
+| 16 GB (physical) and above
+
+| *Storage (disk space)*
+a|
+8 GB (block-based; HDD, SSD, EBS, iSCSI)
+
+Network file systems such as CIFS and NFS are not supported.
+a|
+16 GB and above (block-based; HDD, SSD, EBS, iSCSI)
+
 Network file systems such as CIFS and NFS are not supported.
 |===
 --