To properly configure and schedule your tape archiving jobs, you should understand the environment and factors that will influence the choice of options. Generally, tape archiving settings depend on the following:
1.Data retention and recovery policies effective throughout the organization
Generally, a policy requires that backup data is kept on tape media for the specified period of time and can be safely restored when needed. Retention and recovery policies may differ for file backups, full and incremental VM backups, different applications, and so on. Depending on backup size, type and application, you will organize tapes into media pools
2.Amount of data to record
If you know your average backup size and your tapes capacity, you can estimate how many tapes you will need to archive your data, and organize them in media pools. If you are not sure about the amount of data produced by backup jobs, you can use the Always add tapes from Free media pool option on the Tapes page of Media Pool wizard.
With this option enabled, additional tapes will be allocated from the Free media pool when needed, to let the job complete. If the option is disabled, the job will pause and prompt the backup administrator to add new tapes to the media pool when necessary.
When planning for recording to tape, consider that tape backup engine is optimized for backing up large files (such as VM backups). Backing up large amounts of small files with current version of the solution may exhibit significantly reduced performance, so it is recommended to include no more than 10000 files per job.
3.Tape device configuration
This factor also affects retention and job options (like automatic export). As per industry statistics, the following device configurations are typical for the organizations of different sizes:
•Small environment: 1 drive, 4-8 slots, up to 24 tapes, about 1.5 TB each - this is a configuration for short-term archiving (about 1 month)
•Medium/large environment: 24 — 48 drives, short-term and long-term archiving supported