GFS backup scheme

Hi,

As mentioned in another thread, I've set up a GFS backup scheme for one of my clients on 4 PCs.

I'd like to better understand this scheme ... from what I read here (http://www.acronis.com/support/documentation/ABR10/#1371.html) I was a bit confused over how the daily (incremental) backups will work.

In the backup plan I set up, I have the following:

Daily: keep for 1 month
Weekly: keep for 7 weeks
Monthly: keep for 6 months

I may adjust this to better suit the client and storage limitations, but part of the intention is to have access to the last month's worth of daily backups available for restoration. Will this work? Do the incremental backups rely on the last Full backup (whichever they come after), or a combination of the last full + differential backups?

In the linked explanation of GFS above, the "resulting archive: real" example didn't make a lot of sense. I couldn't figure out why some of the incremental backups were pink (i.e. would not be deleted, even though they were past retention) ... if incremental backups rely on the last Full backup, wouldn't that mean that all the incrementals would be retained until the next full backup? If they only rely on the last full + differential backups, why are there pink incremental backups? (wouldn't the differential backup that took place after them mean they weren't needed anymore?)

Thanks for your help in understanding how GFS by Acronis works.