How to keep old Macs, new Mac, and devices in the same loop
The situation: two older Macs both running Snow Leopard and limited to it by hardware. They have 1PW 3.8.20 and 3.8.21 installed and running just fine.
My principal computer is a Mac mini running Mountain Lion with 1PW 3.8.21 also running just fine.
I'm intent on keeping my syncs local with a fall back to iCloud where necessary.
I sync these three computers via a "sync messenger" set-up suggested by khad (I think) several years ago on the Forum. The "messenger" is an iPad3 with iOS 7.1 and 1PW Pro v. 3.7.2. It's keeping all four units in sync very nicely.
Disruption: two iPhone 5s(s) arrived for Christmas. I want to install 1PW 4 on them and also switch my iPad3 over to 1PW 4.3.2 that's already on it but is presently unused. Then, I would install 1PW4 on the Mac mini so that my primary computer and devices were all on 1PW4 and using wi-fi syncing (and staying local).
That leaves out the two old Macs running 1PW3. If I rule out Dropbox as a solution, are there any sync combinations available via wi-fi (and iCloud if necessary) that will let me keep the two older Macs with Snow Leopard in sync with the Mac mini (and Mountain Lion or Mavericks) ?
Any ideas greatly appreciated.