Hi,
I am not sure yet which version of SAS you have there.I also don't know if you really require a 24/7 SAS service or you can allow yourself some downtime. And I don't know how. Muchrhe size of the data you need to backup.
In any case, I understand you are dealing with physical servers, therefore no VM snapshots there.
It is also very important if you can understand, that SAS is no different to other systems, backup wise.
What you need to ensure is, each time you have a backup, is a consistent one. Eg, you cannot backup a file that is currently in use, or you should not do a backup in the middle of an ETL process. Therefore you need either a time window to backup and/or plan a very good sync process, which is a great option, specially on volume clusters, RAID, etc
And of course a simple copy might not be a good idea, specially under Windows, but the you have great tools as Robocopy and others. I feel confident your company already uses a great tool and processes for backups.
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