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<blockquote data-quote="pxxb1" data-source="post: 1018597" data-attributes="member: 69270">The first full does not change at all, it is the stable data for every backup thereafter. The changes you have done since the first, are saved on each specific inc(remental) or diff(erential) you do. Over and over. For inc:s, for each specificly, for diff:s, cumulative for each.The handling of space and the deleting is different for each back up program so i can not say something about that but the usual is that it erases the 1 full, totally, then the 2, etc. Automatic consolidation exists also, so a whole chain becomes 1 image with all in one, so to speak. Old backups can be deleted when you know they are not valid, important anymore, so basicly it is up to you.Personally i save backup chains internally for 3-4 months then i move a chain or just the full to external storage and save a couple of more months. The external storing has saved me sometimes when i have been able to go back to a specific image to solve a problem that has lingered on in the internal but where not present&nbsp; on a really old one. But that is not so important if you have the before mentioned &quot;to go to&quot; backup to build from in a case like that, which often is easier then rearrange an old backup of the system. Dependent on how much you have to reinstall of course.This practise is for the system, Os, and all important data.A good policy to have, basic thinking, is; how would it be if i lost this. The answer to that tells you how important it is to back it up, and at&nbsp; how many places.</blockquote>

[QUOTE="pxxb1, post: 1018597, member: 69270"] The first full does not change at all, it is the stable data for every backup thereafter. The changes you have done since the first, are saved on each specific inc(remental) or diff(erential) you do. Over and over. For inc:s, for each specificly, for diff:s, cumulative for each. The handling of space and the deleting is different for each back up program so i can not say something about that but the usual is that it erases the 1 full, totally, then the 2, etc. Automatic consolidation exists also, so a whole chain becomes 1 image with all in one, so to speak. Old backups can be deleted when you know they are not valid, important anymore, so basicly it is up to you. Personally i save backup chains internally for 3-4 months then i move a chain or just the full to external storage and save a couple of more months. The external storing has saved me sometimes when i have been able to go back to a specific image to solve a problem that has lingered on in the internal but where not present on a really old one. But that is not so important if you have the before mentioned "to go to" backup to build from in a case like that, which often is easier then rearrange an old backup of the system. Dependent on how much you have to reinstall of course. This practise is for the system, Os, and all important data. A good policy to have, basic thinking, is; how would it be if i lost this. The answer to that tells you how important it is to back it up, and at how many places. [/QUOTE]

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