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Significance of b - s - v numbers?

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What exactly do all of these mean? I had a backup interrupted by running out of disk space (forgot to delete a big file), & have back file names:

..._b1_s1_v1.tib
..._b1_s1_v2.tib

I think and hope I can assume that the backup is just split over two 'volumes', but it would be good to have all this spelled out (s is I think sequence number for incremental backups, dunno about b).

Apologies if I have failed to notice the place where all this is spelled out!

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B is the backup number, or a chain number if you have an incremental or differential scheme
S is the slice number, it is the number of the archive file in one single chain for an incremental or differential scheme
V is the volume number, it is the number of the part of an archive file in a single archive file. If your backup gets interrupted, or if you have limited the size of archive files, or if the size of archive files is limited because of the file format (FAT or FAT32, for example), Acronis will create as many volume pieces as required.
If the backup name finishes by a -1 or -2, there has been a problem. You should validate the backup, and/or create a new task.