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<blockquote data-quote="pigoo3" data-source="post: 1621829" data-attributes="member: 56379">Yes...if those files were deleted...then that is a change.&nbsp; The next time Time Machine (TM) does a backup...those files won't be there (you deleted them).&nbsp; But if you go back a couple backups...those files will still be there (until the older TM backups are overwritten).It doesn't...as I mentioned above.This is the way it works.&nbsp; TM makes backups every hour of only what changed fro the previous hour backup.This is exactly how TM works.&nbsp; It keeps making hourly backups until the drive is full.&nbsp; Then it starts overwriting the oldest backups.&nbsp; TM uses the FIFO accounting method (First In...First Out).If those files are important...then either:- Don't delete them from the hard drive in the first place.&nbsp; You can't treat Time machine like it's some sort of endless/bottomless storage space.&nbsp; You can't just delete files as you feel to make space when using TM.&nbsp; Time Machine with the hourly backups saves a snapshot or mirror image of what's on your HD.&nbsp; If you delete something...then it should only be deleted if you no longer want or need it.&nbsp; Not to create space.&nbsp; Otherwise those files will be permenently deleted when TM overwrites the oldest backups exactly as you described.Time Machine makes backups that mirror your HD at the time of the backup.&nbsp; Erase/delete some files...and yes...they will eventually be lost.&nbsp; So don't delete them if they are important.- back them up onto a USB stick, on the &quot;Cloud&quot;, or on a 2nd external hard drive via the &quot;drag &amp; drop&quot; method (just copy it to an external source manually).&nbsp; This is the way you create space on an internal HD that is getting full.&nbsp; You &quot;off-load&quot; files that are important onto an external storage device.&nbsp; - Nick</blockquote>

[QUOTE="pigoo3, post: 1621829, member: 56379"] Yes...if those files were deleted...then that is a change. The next time Time Machine (TM) does a backup...those files won't be there (you deleted them). But if you go back a couple backups...those files will still be there (until the older TM backups are overwritten). It doesn't...as I mentioned above. This is the way it works. TM makes backups every hour of only what changed fro the previous hour backup. This is exactly how TM works. It keeps making hourly backups until the drive is full. Then it starts overwriting the oldest backups. TM uses the FIFO accounting method (First In...First Out). If those files are important...then either: - Don't delete them from the hard drive in the first place. You can't treat Time machine like it's some sort of endless/bottomless storage space. You can't just delete files as you feel to make space when using TM. Time Machine with the hourly backups saves a snapshot or mirror image of what's on your HD. If you delete something...then it should only be deleted if you no longer want or need it. Not to create space. Otherwise those files will be permenently deleted when TM overwrites the oldest backups exactly as you described. Time Machine makes backups that mirror your HD at the time of the backup. Erase/delete some files...and yes...they will eventually be lost. So don't delete them if they are important. - back them up onto a USB stick, on the "Cloud", or on a 2nd external hard drive via the "drag & drop" method (just copy it to an external source manually). This is the way you create space on an internal HD that is getting full. You "off-load" files that are important onto an external storage device. - Nick [/QUOTE]

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