Hello VM ware snapshot saves the entire status of the machine. A few years back (2014 to be precise) , for implementing a change, I had backed up my metadata servers using a VMware snapshot and recovered it later without issues. I had made sure that users had closed their sessions before taking the backup.
Experiences may vary depending upon the detail.
The point is, there are scenarious where it will be useful.
Coming to your case,with my past experience, SAS can be recovered but open user sessions may have issues.
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