I use CrashPlan to backup my data as mentioned in a previous article – it’s free for local backups and for sharing HDD space using multiple friends’ HDD space. I have noticed that the RAM usage goes up in proportion to the number of files that you have selected to backup – even during the time when the backups are disabled. 
The settings to limit the time that CrashPlan does the backups can be found in the CrashPlan Desktop interface under “Settings->Backup->Between Specified Times”. I have selected From 18:00 to 08:00 and ticked each day – so that backups only happen at night daily. 
I noticed that even when the backup was disabled, the CrashPlanService was using a lot of RAM memory (over 500MB) – and I found my PC swapping to disc all the time – which was slowing my PC down – a bit of a waste! So, I found a way to create a schedule that stopped the CrashPlanService just after 08h00 and start it again just before 18h00.
Creating a scheduled task to kill the service:
Open the “Control Panel->Administrative Tools-> Task Scheduler”
Click into “Microsoft->Windows”: 
and under “Add arguments” enter: /IM CrashPlanService.exe /F 
Creating a scheduled task to start the service:
Click on “Create Task”: 
and under “Add arguments” enter: start CrashPlanService
Your tasks list should look like this:
You can test the tasks by right clicking the task and selecting “Run”:
With thanks to Scott Granneman for his blog that describes the steps to do this in Linux.
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