Synthetic backup questions
Hello, I'm thinking of implementing Synthetic backups on our regional sites as they currently use 3rd party software to sync down to a centralised location, and I'd like to get this all within NBU if possible, but I just have a few questions on how I should layout my policies...
My thinking is it takes a full backup, then differentials, and then when I do a synthetic full, this is essentially a full backup?
So if I were to do a policy with this:
1 - Initial seed, full backup to disk on NBU master server
2 - Daily diff - Mon-Fri
3 - Synthetic full to disk - Last Saturday
4 - Synthetic full to tape - Last Saturday
Will it then start reusing the synthetic full to disk, instead of the initial seed? So I can essentially have 1 full from the remote site as the seed, and then I'm done and don't have to pull 100GB of data from a 10Mb link? Or do I have to keep the initial seed? What retention should I use on the policies? Our general rule of thumb is Monthlies = 7yr retention... So I'd assume, on the initial seed (if I can use synth fulls to disk as the comparison after the 1st month) I set that to a 1 month ret, and then the synth full to tape, 7yrs, with the diffs at 6 weeks, like the rest of our diffs...