Time Machine - how it handles 'temporary' files

I'm wondering how Time Machine handles 'temporary' files. By 'temporary' I mean the following. Supposing that I want to make some legitimate copies of some DVDs that I have made. I load up DVD1 and make a copy. I load up DVD2 and make a copy. I then delete DVD1 and DVD2 from my iMac as being no longer required. Now suppose Time Machine backed up before I did the delete. I think that I am right in saying that Time Machine will faithfully backup DVD1 and DVD2. After all, that is what it is supposed to do. But when I delete DVD1 and DVD2 from my iMac, Time Machine will not delete DVD1 and DVD2 from its' backup archive (again, because that is what it is supposed to do).
So if I continue to make copies of DVDs..say 50 different ones...then that means that, my Time Machine backup will fill up with 50 x 4.7Gb (ie over 200Gb) of stuff that I don't want.
Please understand that I don't have an issue with TM. Just want to understand the underlying mechanics a bit more. If my premise is correct then I guess the easiest option is to temporarily inhibit TM from doing its' backup while I am going through the load/copy/delete process. Only must remember to turn TM back on afterwards.
Thanks

Roger Sinden wrote:
I'm wondering how Time Machine handles 'temporary' files. By 'temporary' I mean the following. Supposing that I want to make some legitimate copies of some DVDs that I have made. I load up DVD1 and make a copy. I load up DVD2 and make a copy. I then delete DVD1 and DVD2 from my iMac as being no longer required. Now suppose Time Machine backed up before I did the delete. I think that I am right in saying that Time Machine will faithfully backup DVD1 and DVD2. After all, that is what it is supposed to do. But when I delete DVD1 and DVD2 from my iMac, Time Machine will not delete DVD1 and DVD2 from its' backup archive (again, because that is what it is supposed to do).
So if I continue to make copies of DVDs..say 50 different ones...then that means that, my Time Machine backup will fill up with 50 x 4.7Gb (ie over 200Gb) of stuff that I don't want.
no, this will not be this bad. TM constantly thins its backups. it keeps hourly backups for 24 hours and then deletes all but one of them. it keeps daily backups for 30 days and then deletes all but one for every week.
so if you had copies of some DVDs on your drive for a very short time they will likely be gone from TM backups by tomorrow.
if you still think some might be kept too long exclude the folder where you create them from TM backups. that's done by adding it to the TM exclusion list in TM system preferences->options.
Please understand that I don't have an issue with TM. Just want to understand the underlying mechanics a bit more. If my premise is correct then I guess the easiest option is to temporarily inhibit TM from doing its' backup while I am going through the load/copy/delete process. Only must remember to turn TM back on afterwards.
Thanks

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Hi, does anyone know how TM should deal with a file that is unreadable due to it residing on a 'bad block' ?
I recently loaded about 250 movie files (about 125GB) onto a 500GB 2.5" USB drive connected to my Macbook Pro (OS-X 10.7.3) and then did a TM backup, including the USB attached drive, to my FW attached destination drive. All appeared to proceed normally and the backup completed. As part of my backup strategy I also then proceeded to make a Carbon Copy Clone of the same USB drive, to another spare USB connected drive. During the cloning, CCC reported that it was unable to read one specific file from the source drive as it was residing on a 'bad block'. CCC advised deleting the affected file and replacing it with a known good copy (the HD would automatically write the file to a good block and map the bad block as unusable).
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Steve, UK.

I appreciate you taking the time to reply, thanks. I may not have made myself clear in the original post. Obviously I would not expect TM to backup a file that it cannot read. The point at issue here is how TM reacts when it encounters such a file. If Time Machine can't read a file that it is being asked to backup then it should really be sounding alarm bells. The screen flashing red and steam coming out of the usb ports may be 'over the top', but I'd settle for a simple message during the backup, or at the end, to notify the user of a problem.)
If Time machine is just ignoring the unreadable file then it's just not reliable backup software. Full marks to Carbon Copy Cloner. It identified a problem with my external drive early enough for me to rectify it whilst I still had another good copy of the file. If I had trusted only TIme Machine I would never have known that one of the files had not been copied.
Thanks anyway. Time to rethink backup strategy.
Regards
Steve.

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I woke up 05:00 a.m this morning, so I'll try to grab my coffe and be more specific:
Of course, in general you should not delete backups.
But:
1) How does your Time Machine Volume react/get filled if you happen to MOVE 100 GB of files between backuped volumes, for instance?
2) If the license for Leopard and Snow Leopard or other software, REQUIRES me to delete all copies of the software from the machine, I need to know a) How I delete all backups of the Snow Leopard partition files. And b) Other software: if the App spreads itself into Libraries, Caches and whatever places, I actually need to know more of the general subject on how I according to the legalese and my own wish, need to find such places in the file system. And delete all copies in Time Machine backups.
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I am new to participating in the Communities, so, yes I'll try to keep the discussion to what the question was!
But right now - please if anyone could answer the problem I already described here, I would be thankful. I'll not argue that Time Machine deletions has to do with the general problem of exactly how Apps occupy the file system.
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/groundliner

Time Machine - how it handles 'temporary' files

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