4.) All I have to worry about is to keep data losses to a minimum - while keeping data losses to a minimum is good practice, ensuring consistency of data at the backup site is even more important. If not, you may have to resort to a time consuming back-up which usually takes a lot of time. Conflicting data can add to the delay and thus consistency should be one of the primary drivers in disaster planning.
5.) Only one copy of back-up data is sufficient - if a copy is being made in synchronous mode and the link fails, the consistency of the remote data will be compromised temporarily till the resynchronization is complete. However, if disaster strikes during this period, data in-consistency will be permanent and may require an extensive re-working (link failure can be prevented by having WAN redundancy) |