At this time, is mCan the Arcserve UDP 7000 appliances protect more source data than the disk capacity of the appliance?
No, you need capacity for all source data, multiplied by the number of backups retained.
Only when using tape.
Yes, Deduplication and Compression typically allow for 3 times the capacity of the source data protected.
Only if all drives are SSD. aintenance required for the appliance