It looks to me that CrashPlan is actually not consuming much system resources, at least not during the PCPitstop OverDrive testing.
Recommend that you leave it as is for now.
Do you create quite a bit of new file information every day?
For instance, important new files would probably be created daily if you were using the machine to run a business or online website.
But if you were simply browsing, viewing media, exchanging email and social media, you probably don't create many files at all.
If not creating many files as per above example, then you might benefit from adjusting the schedule to something other than every day, depending upon your preference. Maybe weekly?
That's up to you.
I've not installed nor used CrashPlan yet, so I can't be of much use to you with changing the schedule settings.
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What is the Model of your ASUS NetBook?
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You can discover how much and what exact type of RAM your machine can use, plus get an idea of the cost involved, by running the Memmory Scan at
http://www.crucial.com
It too is a safe utility, and will provide you with some good information about RAM.
You do not have to purchase from Crucial in order to use their scanner and decision making process.
Once you know what kind of RAM your computer needs, you can go shopping, locally or online.
I do sometimes purchase from Crucial, but more often from NewEgg, TigerDirect, and even Amazon.
Fortunately your machine now appears to have just 1 stick of 1024mb RAM (we don't yet know the type and you will learn by running the Crucial scan).
But you would be able to purchase one additional stick of 1024mb in order to double your current RAM… and that might be enough, depending about our usage and how briskly you wish your machine to perform.
4GB would be "better" but you would have to purchase 2 identical sticks of RAM, remove the current one stick and install 2x2048mb RAM in order to reach 4GB on that machine.
If it were me, I'd go for the 4GB if I had the ability in my budget.
That is a cost-benefit decision for you to make, but you probably "need" at least 2x1024 RAM
You can have a local shop install it, if you prefer.
Or RAM is fairly easy to install yourself, even on a NetBook.
Your owner/user manual should provide instructions of "how-to.
Microsoft Securtity Essentials is free to use for private individual use, though you should check with Microsoft if you are using it for business purposes.
MSSE is still "free" for small business use unless you exceed a large number of machines in your office running MSSE.
If you opt for Microsoft Security Essentials, go ahead and download the installation packet from Microsoft.
And then Uninstall AVAST! completely before installing MSSE.