sgtray.exe is a utility from VERITAS Software Corporation which installs itself on the system tray bar, and serves to remind you to backup your files. This is a non-essential process.
Disabling or enabling it is down to user preference.
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Non-system processes like sgtray.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues