It,s all a matter of personal preference and also on how big the image is and how long it takes to create your backup.
I use Acronis all the time as a tool rather than just an insurance policy for when disaster strikes.
Mine is set up to take a full image (around 11Gb) every day and once a week I run a complete restoration.
If everything is OK I delete all the images up to the latest one and start the cycle all over again.
At the hint of any problems with the system it only takes me about 20 minutes to restore an image which is never more than 24 hours old and the problems are history.
Anything of crucial importance,like docs/pics etc. just get copied/pasted to my ext HD as a matter of course anyway.
By the way there is nothing to stop you taking advantage of the Acronis TI 11/Disk Director Suite all for $9.99 this side of the pond.
Did it myself this morning.