Hello Virtuamlin support team,
We currently have NAS device on-site that we are doing full nightly backups to of all virtualmin domains/servers. We also have an offsite NAS device that we are seeking to employ for additional (offsite) backups.
We need to get virtualmin configured in the best way possible to most effectively & efficiently back up the domains.
We would like to continue to do nightly full backups to our on-site NAS, and then also do a weekly (or monthly or bi-monthly) full backup to our off-site NAS. We would also like to do a daily incremental backup to the off-site NAS. This way we are able to meet the following objectives:
Full data offsite so that in the case of a local catastrophe, we will still have all data & be able to restore/rebuild all sites to the state that they were on the previous night.
Full daily backups on-site for quick restores when needed (we are less concerned about the throughput usage with the full on-site backups since they are not going over the internet).
Efficient use of bandwidth for the offsite backups (doing a full backup of all servers took 4-5 days last time I did it) (this included constraining our offsite NAS device to 1Mbps download in order to not have a major impact on our internet service at our office).
I am not clear on the best way to do this via Virtualmin. Based on the user interface, it seems that the incremental is what Microsoft calls a "Differential". This is a full backup of all files changed "SINCE THE LAST FULL BACKUP". That will work for us. But the main problem as I see it is that our daily full backups to the on-site NAS will probably cause the offsite incrementals to only have data changed since the previous day, rather than since the last off-site FULL monthly backup. This is because the daily full backups to the on-site NAS will probably essentially reset whatever bit/attribute virtualmin is using in its logic to determine which files have been included in a recent full backup.
I could be wrong on this, as I don't know all of the inner-workings of virtualmin under the hood.
In any case, I do appreciate your assistance in helping me to determine the best solution to get the backups configured in a way that will meet our objectives.
Douglas Mortensen Impala Networks, Inc.