I am currently using Kopano and have more than a decade of PIM data in it (tens of thousands of appointments, TODOs, contacts).
I am currently syncing to Outlook (with the MAPI Zarafa Connector) and to my phone (via ActiveSync). All my data is currently in a ~200MB Outlook PST file.
Do you have experience with using Nextcloud with such a large data base? Does it work reliably to handle tens of thousands of items?
When I sync via CalDAV with my iPhone (or macOS), will the whole data set be synced? This is not really something desired because (a) it’s a lot of data that unnecessarily needs to be synced and stored on the mobile device (b) there is always chance that sync is messed up and a ten year old item gets changed even though it shouldn’t. What’s the best way to handle it?
What is the best way to migrate my data from a PST file to NextCloud (Appointments, TODOs, contacts)?