Best Practice - Ensure You Can Restore
When all is said and done, your backup is useless if you’re unable to restore
files or even entire systems when the need arises. But beyond that, you also
need to have the confidence that should you ever need to turn to a backup, it
will be there and ready to go.
Therefore, it’s important to consider the following factors:
With any archived data frequent testing of restore capability is recommended, if
Compliance and other regulatory retention requirements can call for data to be
kept for years, so you need to ensure that the storage medium selected has
sufficient expected shelf-life. In general, tape life expectancy is between 4 to
6 times that of disk (in fact, media manufacturers for LTO tape specify
expectancy of up to 30 years!)
While the random access of disk supports fast file access for restore, for batch
streaming restores of large amounts of data, tape may prove the most efficient.
Powerful software indexing can also facilitate individual file restore from
Disk May Be Necessary, But is Not Sufficient
Disk usage has been expanded via new technologies such as mirroring and
replication, however if something were to affect the original data (error,
system failure, virus, hacker), the problem could be propagated to your backup.
An off-line copy of data is needed that is not susceptible to on-line
corruption. Tape provides a secure, offline, system isolated copy of the data –
and the ultimate recovery mechanism.