On Mar 9, 2009, at 11:56 PM, Marcel (Felix) Giannelia wrote:
If this operation were used to make backups sparser the farther back
in time you go (which seems to be what people on the wiki are
after), and rdiff-backup already keeps snapshots every 10 increments
or so, maybe just discard the ones that aren't snapshots? And then
you might be able to shrink those snapshots by in turn diff'ing some
of them with each other, as in:
Before consolidation: [current mirror] <10 diffs> [snapshot] <10
diffs> [snapshot] <10 diffs> <snapshot> <10 diffs>
becomes: [current mirror] <10 diffs> [snapshot] [snapshot] [snapshot]
and then: [current mirror] <10 diffs> [snapshot] <2 diffs>
Interesting idea, except that rdiff-backup doesn't make a snapshot
every 10 backups, it makes a snapshot every 10 times that a file has
changed.
What people want to be able to do is "delete the backup from 6 days
ago, preserving the ones from 7 days ago and 5 days ago". At that time
in the past, file A may be a snapshot, and file B may be a reverse-
diff. File A is easy to handle (7 days ago becomes a snapshot), but
File B requires a merge-diff operation.
Andrew
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