A costumer is considering purchasing a virtual library system (VLS). Because of budget constraints they want to maximize data compression as a way to minimize costs. Which factors affecting the dedupl

Data change rate determines what percentage of blocks differ between successive backup cycles - a low change rate means a large proportion of blocks are identical across backups, yielding a higher deduplication ratio and greater storage savings.

Data retention policy controls how many backup generations are retained - longer retention keeps more overlapping backup sets with shared duplicate blocks in the deduplication store, increasing the ratio and improving overall storage efficiency.

The number of data streams affects backup throughput and ingest parallelism but has no direct impact on the proportion of duplicate data present in the backup repository.

The allowable time window constrains backup scheduling and performance but does not influence the ratio of duplicate to unique data available for deduplication processing.

Tape cartridge capacity is a physical media characteristic irrelevant to deduplication, which operates within the disk-based virtual library system and not on tape media directly.