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Please read carefully: My 'preference' is to run a full virus scan and smart scan once a month.
1. Is the Smart Scan included in a full virus scan or do the Smart Scan and Full Virus Scan scan different areas.
2. Avast's real-time protection consists of 'File Shield,' 'Behavior Shield,' 'Web Shield,' and 'Mail Shield', all of which are considered on-access scanning?
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The Smart Scan isn't part of the Full Virus Scan (as far as virus scanning goes), the Smart Scan is scanning different areas and files (to a lessor degree), you can see this in the fact that it is quicker than the Full Virus Scan. See Note below.
Open the avastUI Settings > General > Smart Scan and expand that section and you will see what it will scan. In the Scan for viruses, you can click Customise and see what is scanned.
I suggest that you spend a little tine checking out the avast settings and you will get an idea of what each scan does and how you can further customise your scans. Then you will be able to decide what you want to run.
Note: It used to be that the Smart Scan could be customised in two areas, the one above and from the Smart Scan. Avast were meant to be changing that so it was only customisable from one location (within the Protection area). But I have yet to see that yet, I don't know if it is in the current beta testing session that is running.