I have the notion of what an incremental backup is... it would be keeping the "delta" from the last state, but how is this done in practice? Is it done with "tar" with some flag? Can we compress the backups (tar.[gz|bz2]) or it needs to be uncompressed to create the "delta"? Can we do a "2nd_delta" from a "backup + 1rst_delta"? Or the "2nd_delta" is created directly from "backup" therefore overriding the need for the "1rst_delta"?
Maybe its not even done with "tar"... I keep thinking on "diff's" and "patch's" but maybe its not the same here.
If one needs the (uncompressed) initial tar available from a backup to find the "delta", this means we need a "2xN" disk, where "N" is the info we have in disk.. so you could only do incremental backups in a disk with less than 50% occupation.. rigth or wrong?
What do you say? Pointer to right commands/howto's? Thanks Joao Clemente
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