When I back up on my exertnal HD drive with time machine can I erase what on my computer HD for more space?

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When I back up files on my exertnal HD drive with time machine can I erase what's on my Mac HD for space without losing what's on external HD?
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If the data is valuable to you, redundant backups are essential.  Time Machine is an excellent vehicle when you have to restore data that no longer exists on your internal HDD.
Mende1's suggestion of using Carbon Copy Cloner is excellent because it gives yous a HDD that is 'ready to go' should your internal HDD fail (as all HDDs eventually will). 
For example, I have 5 copies of my iTunes folder, one each on three MBPs, on a HDD devoted strictly to iTunes and Time Machine (this does not include the iPod).  One may view this as excessive but since I have over 100 GB in this application, I am very comfortable with this.
I advocate that the best backup strategy is Time machine combined with a boot HDD and a third HDD for the most important user data.  If there is non essential data, the you may certainly compromise and use just Time Machine.
Ciao.

I am backing up my computer to an external hard drive using Time Machine.  It has been at 288.91 "used" for a while... should I just let it ride?  It's been going for about 7 hours now.

I am backing up my computer to an external hard drive using Time Machine.  It has been at 288.91 "used" for a while... should I just let it ride?  It's been going for about 7 hours nowIt does not immediately delete the files that are missing.. i

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When using Time Machine, if I delete items from my computer, will they still be backed up to access later on my external hard drive? In other words, when time machine backs up again, will it delete the files from the back up?

When using Time Machine, if I delete items from my computer, will they still be backed up to access later on my external hard drive?  In other words, when time machine backs up again, will it delete the files from the back up that I have deleted from

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Time machine can not back up

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Every time I try to back up my Macbook Pro with an external hard drive using Time Machine, I receive the error of "the disk does not have enough space". I have a 500GB hard drive and only 120GB Macbook. It worked fine before the latest Maverick's

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When I erased and installed Snow Leopard in my iMac, after backing up with Time machine... I notice that right after the iMac boot up, time machine asks for the extenal drive to be use for backup, I click yes, and after that all my stuff was erased a

I just fix my macbook air because it was kernel panic. They changed the hard drive. I could not back up with Time Machine, because it did not work and I had over Adobe creative suite 5 design premium student. But I finished my studies last year and I'd li

I just fix my macbook air because it was kernel panic. They changed the hard drive. I could not back up with Time Machine, because it did not work and I had over Adobe creative suite 5 design premium student. But I finished my studies last year and I

Back-up with Time machine is soooo slow.

First back-up with Time Machine. I have a lot of pictures but not much else - but bout 80 GB. Not using encryption. The back-up has now run for 24 hours - and has only managed to back-up 8 GB - reminaing time estimated to 8 days ! Back-up by wire to

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HT201250 I accidentally didn't save a document on my desktop--a report.  Can I go back with time machine and recover my desktop and save the file?

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My Imac drive just died. Always backed up with Time machine to a WD My Passport. But after connecting it to my other imac (also running Snow Leopard) all the files are missing. I click on backup.backupdb but no files - just applications. Any ideas?

My Imac drive just died. Always backed up with Time machine to a WD My Passport. But after connecting it to my other imac (also running Snow Leopard) all the files are missing. I click on backup.backupdb but no files - just applications. Any ideas?We