"Copy until full" tool

[Andrea Venturoli <ml at netfence dot it>]

Hello.

I've got a 2TB backup HD which is filled with several copies (at 
different times) of the same data; in other words, I could have the 
following directories:

Data20170117
Data20170110
Data20170103
...
Data20161220
User20170117
User20170110
User20170103
...
User20161220
DB20170117
DB20170110
DB20170103
...
DB20161220



Now I periodically need to copy this HD to another one, which is, alas, 
only 1TB.
So I'd like to only transfer the most recent copies, either until the 
disk is full or by specifying a number of "copies" to keep. Of course 
the older ones should be deleted.

Think rsync (which I've been using extensibly), but with a size barrier.



I could try and write my custom script, but I'd hate to reinvent the wheel.
Does such a tool already exist in Cygwin?
Failing that, somewhere else?

Bonus for retrieving the original data via FTP, but that's not required.

 bye & Thanks
	av.

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