Re: Interrupted backups

[Arnt Gulbrandsen <arnt@gulbrandsen.priv.no>]

That's not entirely how it works.

On Wednesday, the tarsnap client needed to make a backup and started 
computing the set of blocks needed for that. Some of those blocks had 
already been uploaded, others it uploaded.

On Thursday, the tarsnap client needed to make a backup and started 
computing the set of blocks needed for that. Some of those blocks had 
already been uploaded, others it uploaded. When it was done, it recorded 
the fact that Thursday's backup was complete.

Thursday's tarsnap invocation could not tell whether the already-uploaded 
blocks were uploaded on Wednesday or earlier. It just knew that the blocks 
were needed for Thursday's backup, and were present on the server since one 
or more earlier backups needed them.

(I'm lying very slightly.)

Arnt