Data backup processes

[shawngerrard]

We need backup processes to store all application data in the Asterion AWS infrastructure in the event that a critical failure occurs, causing data to become corrupted.

The best solution would be a job template that can be integrated with existing git workflows, which will run a process to completely store data in an archive file (7z, rar, tar, iso, etc) format prior to commencing actions to replace parts of our infrastructure.

The destination can just be local storage for now, but the final intention should be comparable to storing on a NFS that can be shared across all nodes/clusters.

[jmhbnz]

One approach we could use for backing up all applications is taking a backup of all k3s persistent volumes, which are stored on disk. This might be a bit heavy though, let's prioritise this issue lower compared to #9 and #10.