To keep PPC-macs, intel-macs and iOS in sync I use:
on a daily base:
- TaskPaper 1.0 (PPC), TaskPaper 3 (intel), Taskmator (iOS) for Outlines (Sync via Dropbox)
rarely:
- SOHO Organizer for Sync iCloud Cal/Contacts. (Sync via iCloud)
- MacJournal 5(PPC) / 6 (intel) und iOS-App for text-notes (pictures don't sync with the PPC-version). Sync via iOS-device (PPC<> iOS <> intel)
- SOHO-Notes for text-notes, PDF and pictures (PPC/intel/iOS); Sync via iOS-device (PPC<> iOS <> intel)
Unfortunately support for SOHO-Notes/Organizer will be dropped with future macOS-versions, since the program code seems to be to old to be upgraded ...
for my "old-fashioned" PageSender Fax-Center I run an separate Contact-database within the contacts-app (which is unfortunately not able to be in sync with iCloud) and manually spread that contact database to the other PPC-macs by export/import.
Paperless-Office (also for notes) = my bread&butter-app: DEVONthink
on each Mac I've created a DEVONthink-folder within my user-folder which holds another DT-folder primarily for that specific mac. With CarbonCopyCloner i make scheduled backups from that mac to an USB-stick as soon as both are connected.
So the USB-stick holds them all ...
pb15"/user/documents/DEVONthink/DEVthink-PB15/DT-databases of PB 15"
pb12"/user/documents/DEVONthink/DEVthink-PB12/DT-databases of PB 12"
MacBook2008alu/user/documents/DEVthink-MB2008/DT-databases of MB2008
white intel imac24"/user/documents/DEVthink-iMac/DT-databases of iMac
etc.
... together in one folder with subfolders:
DEVONthink/DEVthink-PB15/databases; ... /DEVthink-PB12/databases; .../DEVthink-MB2008/databases; .../DEVthink-iMac/databases etc.
As soon, as the USB-stick is connected, the DEVthink folders of the other macs are synched from USB-stick back to the local mac too.
Changes to DEVONthink database(s) are only allowed to those databases belonging to their local-mac.
So I can view and search the other databases too and all Macs are fairly in sync and I have backups both on the USB-stick and each mac.
I use a DEVthink-folder named-after and for each single mac, because synching with CCC can be scheduled best by this way: one task mac2usb, several tasks usb2mac that run automatically, as soon as mac and USB are connected.