Could some (from Acronis, or someone else who knows this stuff) please verify my assertions/assumptions in this message? I would like to have a comprehensive description of the automatic TIB file naming conducted by ATI 11 backups. The product documentation lacks this level of detail - my assumptions here are based on tests. TEST Source Data: C:/data - folder with 60G of data TIB/Backup location: \\fileserver\backup\Daily.tib Options: Split archive into 15G chunks Backup type: differential The first time the backup runs, the following are created (file is split due to option to split into 15G chunks): - Daily1.tib - 15G - Daily2.tib - 15G - Daily3.tib - 13G The next time the backup runs, Daily4.tib is created (roughly 400M). Succeeding executions of the backup creates Daily5, Daily6, ... Dailyn. If in C:/data there is more than 15G of modified data (since the first execution of the differential backup which acted like a full backup), the next execution of the backup will create multiple Dailyn.tib files, due to the splitting. Assertions/Assumptions: All executions of a differential backup to the same location (same TIB file) will produce new TIB files with a numeric suffix added to the base name (<file>). If an execution of the backup requires multiple files due to archive splitting, than n files will be created: <file>k+1 ... <file>k+n. Data recovery is conducted by using the base file, or the first one in the sequence. A sequence of differential backups allows a checkpoint of the data each time the backup was run. Restarting the sequence requires the files to be renamed/removed before the backup runs as each successive execution of a differential backup to the same TIB file will create new files in the same series. Thank you, Kevin.