calculation of the space of time machine

I'm not to give lectures on safeguards. Before yesterday I made a backup on a disk IDE 80 GB about 2 years ago, and I got my MBP since I bought it in mid-2009. Recently, I tried a new backup on the same drive, but my data were passed to about 150 GB, so TM reported that there was not enough space. This is why I bought a 250 GB SATA drive and started the backup. TM was told he had 150 GB for backup and that it would take about 5 hours. In an hour or two it was over and the amount of space occupied on the SATA was just below 80 Gb. Strange - I think - but everything seemed ok. I used the disk utility to check the SATA and he said it was ok. Then, I connected the HDD IDE 80 GB, erased all the data and set as the backup in MT and Mt finally told me that he had 150 GB for backup and the 80 GB drive has been insufficient. What is going on? Is it possible that I can check that the SATA drive contains a full backup? (Note that I did not exclude anything to save.)

I've seen similar and I suspect the backup that you did on the largest disk is correct. Time Machine backup of data, applications and operating system, but there are a lot of things, he's not back until - caches, mobile backups and other files of the operating system or applications can recreate. Algorithm of TM to estimate the amount of space required does not appear, however, to take into account the files, it won't save.

Tags: Notebooks

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