Whoops. Sorry for the misinfo, John. -M
On Wed, Mar 19, 2014 at 1:02 PM, Colin Percival <[email protected]> wrote: > Hi all, > On 03/19/14 07:39, John Gamble wrote: >> Thanks for your reply and apologies for not noticing that bit in the manual. >> So >> if I've understood it properly, the answer is yes, Tarsnap can re-start a >> partial archive. > Not exactly. You can create a new archive, and any data available on the > server > side -- if you hit ^Q or sent a SIGQUIT and waited for tarsnap to exit > cleanly, > or from automatic checkpoints, or from previous archives -- will be used for > deduplication in order to reduce the amount of new data which needs to be > uploaded. > But if you were creating an archive named "backup-wednesday" and it was > truncated (deliberately or because it failed and a checkpoint was recovered) > then you'll have an archive named "backup-wednesday.part", and you won't be > able > to create a new archive named "backup-wednesday". You'll be able to create a > new archive named "backup-thursday", however, and then you'll have two > archives > stored. (After which point you might want to delete the first partial > archive.) >> I guess the command to re-start would be exactly the same as >> the initial command. Would that be a fair assumption? > Yes except that you need to pick a new name. Once you create an archive with > a > particular name, it cannot be overwritten -- it can only be deleted, and that > only if you have the delete keys. Being able to separate "can create > archives" > and "can delete/destroy previously created archives" (see tarsnap-keymgmt) is > very important in high security environments. >> If this isn't a completely thick question, how would I know the archive was >> now >> whole and complete? That is, no data missing or lost? > If tarsnap exits without errors, the archive completed successfully. Also, if > 'tarsnap --list-archives' shows the archive name (without ".part" added to the > end) then the archive was not truncated. > -- > Colin Percival > Security Officer Emeritus, FreeBSD | The power to serve > Founder, Tarsnap | www.tarsnap.com | Online backups for the truly paranoid
