Better yet, simple can  be can be inexpensive! Purchase a larger external hard drive (two if you can afford it) and download Robocopy, a free utility available from Microsoft. Once installed, it is as simple as the following:

robocopy C:\ E:\backup_C_Drive /MIR /R:0 /W:0 /REG /V /ETA /LOG:E:\mirror.log /TEE

This MIRrors the C drive to the E:\backup_C_Drive, Retrying 0 times, Waiting 0 seconds, REGistering the previous as the default in the REGistry, Verbosely displaying output, showing the ETA (estimated time of arrival) for each file, LOGging the output, TEEing (outputting) to the log & console.

Add additional drive and remote files share. Then run this nightly using the Task Scheduler. If necessary, differential backups job can run against the mirror. This one two approach get you daily backups with rolling history for your files. 

Using this technique will same you time and money beside you will sleep well knowing that your data is backed up ready to be restored!