still some doubt that why the backup program is required for some body ??
I am a person who use / depend largely on my desktop HDDs
I have internal hdd of 3.5TB (3x1TB +1x500GB + keep on adding). I keep most of my data in desktop HDD's. I have two external HDDs(1TB+500GB) for backup important datas from desktop HDDs (To access in laptop/office pc's etc). One is important software i need/purchased + movies/songs , and second one purely my photos/documents.
First one, I do not use any software to update. I manually copy / paste the Software/Movies/Songs in external one.
The moment I connect my second external hard drive, I get my desktop data (documents & photos) synced and update which ever is missing in external HDD. So, I need not manually copy the data / folder one by one. You may not be remembering which files you created especially in case of documents. So, i just let it run .
The same can be done if you are using other backup software like Windows Backup/Easeus todo backup etc.
One time backup - No need of backup software.
Update /sync - Better to have a backup software.
I lost almost all my photos in 2006 when my HDD Crashed (no data recovery was possible). So, I am really careful about my data these days. I keep the same data at least two three places if that is important to me.
I do not know whether i confused you or helped you
. Anyways, do not worry much if you use only for watching movies on tv / copying movies etc.