Is it possible the size of snapshot volume is less than the volume attached in same instance.

No, not possible. As the volume capacity will be high we cant create lesser snapshot volume

Is it possible the size of snapshot volume is less than the volume attached in same instance.

Is there oracle cloud breach?

Remote desktop connection app working chart please

[Start RDC App]
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[Enter Remote PC Details (IP/Hostname)]
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[Connect to Remote PC]
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[Authentication (Username & Password)]
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[Network Connection Established (RDP over TCP 3389)]
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[Encryption and Security Established]
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[Remote Desktop Session Starts]
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[User Interaction with Remote PC]
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[Manage/End Session]
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[Disconnect and End Connection]

Why private key format .pem use with OpenSSH. Why not .ppk?

The reason .pem format is commonly used with OpenSSH instead of .ppk  format is mainly due to compatibility, standardization, and the design of OpenSSH itself.