We have an increasingly large volume of data. A lot of it is high resolution images and video, which do not compress well. We currently use an Ultrium 3 tape backup drive (400GB/800GB). The compression ratio we get is about 1.02.
We've had this for about 9 months and have reached the capacity of a single tape. At the time we were encouraged to get a single drive, rather than a robotic tape library as we were going to be taking the tapes offsite daily anyway.
Now that we have hit the 400 GB limit I'm looking to switch to Incremental backups to spread the load over multiple tapes, but still only use 1 tape per night. A lot of our data remains unchanged (as I said, images and video)
I've just added an extra hard drive (143 GB) to our RAID 5 array and I am likely to need to add another one in the next couple of months.
With our growing storage needs and backup requirements I'm looking to find the best solution to make the most of what we have and find the best value solution for the future.
I'm hoping to add a second tape drive (of the same type) to allow backups to be spread over 2 tapes (with a doubling of the number of tapes).
I'll be looking for future expandability, and supporting reasoning behind your solutions for points allocation.
We are using the Symantec Backup Exec Software on Windows 2003 R2 Standard.