@anxiousguy
honestly there is no way to know for 100% sure, even with the badge system as this only highlights how many threads they have answered and how many people marked them as a best solution in any given topic. what i highly suggest and even for my own answers is that you double check them with a little research on your own. while the answer may of course be correct it is always a smart idea to double check ANY source of information be it from a person you know, a trusted website, a forum, a book or any other information source.
high post count - this means that they are an active contributor here. a good sign, but does not always mean their answers are top notch
high best answer count - a good sign as this means they are often selected as the answer in a thread. doesnt mean top notch answers but an indicator.
badges - given when a ba is received for a topic area. a good indicator they are active in your question genre.
top listed - eternal champion or similar titles are a good indicator of being active and respected
edit - for ease of showing you.. relevant badges show up next to a users name here in threads. see the icon next to our names. i added a samsung tag to this thread just to show you how it works. hover over a users avatar will show you their post count, ba count and time here. clicking on their name (in our case next to our moderator star.. normal members dont have a star) it will show you their complete badge list. in order of how hard they are to get: green to blue to red. gold are special and a few are easy while many others require special conditions to be met.
of course this is not to say that a new member with very little of the above is incapable of answering a question correctly. all the above really say is that a member has been here for awhile and has been active. a new member can easily have a wealth of good information but it might be hard to see that up front because they have not been here long. i always suggest reading the content they post and then double checking it to make sure of it yourself.
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by chance would you be referring to your recent "cloning a drive" thread?
if so, both ghost and hirens are well known and respected programs. there are alternatives of course. i would also like to note that if you "clone" your drive completely at regular intervals it is a nice backup as all you need to do is just swap the disks in your system to get it working again - no usb disk booting or lengthy restores at that time. the downside is that cloning a full disk takes longer than incremental backups. both can be good solutions depending on what your needs are (any backup is better than none) but i personally prefer cloning myself (again, my own preference)