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Re: tarsnap feature question
On Wed, Apr 3, 2013 at 2:57 PM, Daniel Staal <DStaal@usa.net> wrote:
I know of other backup products that can be configured to do so, and I've seen it be useful on occasion. Sometimes precisely *to* remove the files that didn't exist at the time of the backup.
This is off-topic but...
A thousand years ago when I was a baby system administrator I did my first "full restore" of a level 0 tape followed by a restsore of the level 1 tape. These tapes had been made by SunOS "dump".
The second restore didn't fit on the hard disk. I was confused. How could this be? The backup was from that disk. How could the restore not fit?
The answer was that between the level 0 and level 1 dumps someone deleted a lot of files and someone else created a lot of files. The merger of the two restores was more than could fit on the disk. I finally solved the problem by doing a restore to a bigger disk. However users were confused that a lot of files they had deleted had re-appeared. (I believe "restore -r" creates the "restoresymtable" file to track this kind of thing and will remove the files that were deleted.)
This bit of Unix history brought to you by Tom's Brain... Full of useless information but happy to share it (tm).
Tom