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10.5: Make a bootable Time Machine backup drive
Authored by: macavenger on Jan 24, '08 08:33:21AM

No, TM won't overwrite any data already on the disk. It only uses all available space on the drive. Actually, in my experience so far, even that isn't quite accurate. I've been running it since about a week or so after 10.5 came out, and the space used by time machine appears to be holding fairly steady at about 10 GB more than the space used on the drive it is backing up, far less than the available space on the TM drive. Course, my files are relative static- if you change a lot of files, especially big ones, it would doubtless use more space, but probably still not gobs more.

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Aluminum iMac 20" 2.4 GHz/3GB/300GB HD



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