Time Machine Permissions

Issue

I'm having an issue backing up using Time Machine. I get an error when selecting the NAS as a backup disk for Time Machine:

You do not have the necessary read, write and append privileges on the selected network backup disk.

Please connect as a different user or contact your network administrator.

I think the permissions on the Time Machine share are messed up and there isn't an option in the GUI to fix/reset permissions as with other ReadyNAS Shares.

Current State

I'm running RAIDiator 4.2.31 and installed new disks (4 x 4TB WD RED) to replace my old 1TB drives. I'm running macOS High Sierra 10.13.2 and also tried macOS Sierra 10.12.6.

How It Happened

I backed up my data to USB prior to replacing my drives. I then replaced the drives and did a factory reset. I then restored data over USB using a Backup Job:

Source: [USB Device (Rear Top Port)]
Destination: [backup]

This worked great for my custom share "backup" and I'm able to access the data, delete, add, etc.

I also tried to restore my Time Machine data using a Backup Job:

Source: [USB Device (Rear Top Port)]
Destination: [Time Machine]

Attempts to Resolve

I tried disabling Time Machine, rebooting the NAS, changing the User/Password for Time Machine, etc.

I also tried the Time Machine Backup Job restore first without then with these backup options selected:

1. Remove the contents of the backup destination before a full backup is performed. This will clean the backup destination of files which were removed in the backup source. Warning, This will delete all files and folders in the backup destination.

2. After backup is complete, change ownership of files in the backup destination to the share owner if the destination is a ReadyNAS share. Warning: Do not use this option if any files or directories should retain their current ownership.