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I have a problem with our current method of backup. We're doing daily incremental backups to a NAS with a 30 day retention period. I have the backups split into separate jobs, because the drives I'm backing up are anywhere from 2-5+ TB of data on each drive. After the backups complete, there is a separate scheduled task to run a RoboCopy script to sync the files from our first NAS to a second NAS for disaster recovery purposes. The backups are set to merge the oldest incremental with the other incrementals after the 30th backup. Originally, we had it set for a synthetic full, but I abandoned that option because after the 30 retention period, the full backup started merging with the oldest incremental and the date/time stamps were changing each day, and the sync between the NAS's was never completing within the time window each day because I was essentially re-copying 10+ TB of data each day.
I changed this to not do a synthetic full because I wanted the original full backup to remain intact, with the same size file, and same date and time stamp on it as well. The issue is now that I've hit the 30 day retention period, the oldest incremental file is now merging with the second-oldest incremental file, but the time/date stamps are changing on ALL of the incremental backup files. The original full backup remains unchanged, as I hoped and expected.
This really isn't too big an issue on two of the three data drives being backed up, because their incrementals are not too large, collectively, but my biggest drive (which is 5+ TB in the original full backup) has enough changes in the data each day, that by the 30th day of backups, all of the incrementals are now almost 3TB in size, collectively. Because all of the incrementals have new date and time stamps, RoboCopy wants to copy these each night. This means I now have to copy 2+ TB of data between the NAS's each night. This is not going to work for me.
How come when the incremental merge occurs, it changes the time and date stamp on ALL of the incrementals? Does it really make a change to any of the incrementals that are not part of the merge? Is there something else I can do to get what I want?
Essentially, I want to have my one full backup, with at least the last 30 days of incrementals. I want to run the sync script to copy these files between NAS's after the Macrium backups are completed. I would only want to have to copy the files that have really changed since the last full or incremental backup.
Is this possible?