When does TM erase backups for removed USB/FW drives?

I have a MacBook Pro running 10.6.1 and I have a 2TB Western Digital My Book Studio (formatted HFS and attached with FW800) on which I store a lot of data (about 1.2 TB).
I have a couple of backup strategies including Time Machine (my Synology NAS acts as Time Machine server) and I would like to understand better what happens if I allow TM backups to occur WITHOUT my WD My Book FW800.
My concern is - would TM automatically 'remove' the backups of my FW drive if it's not connected when a backup occurs? This might occur once every four backups...

rafsanchez wrote:
Pondini wrote:
That's not what it says, and not what it means. That article is about when to use Time Machine vs. the Backup application (part of a Mobile Me subscription).
Whilst the KB does mainly deal with when TM should be used and when Backup should be used, I'm not sure what you mean by "that's not what it says"? The KB does clearly state (as I quoted in my post) that "Time Machine allow you to back up data to a network volume". Perhaps Apple needs to change the text of this KB and make it clear that the "network volume" they mean is only the Time Capsule or later AirDisk.
Perhaps you need to tell Apple that: http://www.apple.com/feedback/
TM will do network backups, but only to a Time Capsule; or a shared disk on another Mac running Leopard or Snow Leopard on the same local network; or a USB drive attached to a (recent) Airport Extreme.
Actually this is not correct as I have been successfully using both Synology and a ReadyNAS devices as TM volumes...all that is needed is a network volume that supports sparsebundle disk images (no firmware hacks on either the NAS or the Mac are needed).
Yes, sometimes it will. Excuse me for not prefacing that with the word "Officially."
There are a number of threads here and in the +Leopard / Time Machine+ forums where it works for a while, then something goes wrong, and there don't seem to be any solutions.
There's even a chance that your backups will be useless just when you need them the most.
I'm not worried about this because, as I mentioned in my original post, I have a couple of backup strategies
As long as you (and others who might read this) understand the risks.

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When does TM erase backups for removed USB/FW drives?

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