Deleting Files to Update computer

Hello,
I am wondering if after I back up my computer onto an external hard drive with Time Machine. Can I then delete the files from my start up disk to get space?
Thanks!

Welcome to Apple Discussions!
Only if you don't value the files you just backed up that you are tossing, or if you choose to backup just those files to DVD elsewhere, or another hard drive so they are not dependent on being part of the Time machine backup in the future. Time Machine keeps archives only so long as it doesn't fill up the hard drive it is backing up. Then it starts trimming those archives automatically each backup. You can temporarily disable Time Machine to get those files off somewhere else. But remember what my backup FAQ* says:
http://www.macmaps.com/backup.html
Always keep at least two copies of your data at all times.

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