You should at least be able to access them at the website of where they're synced.
Sounds like you're using your Contacts app as sort of a CRM system. I hope your exporting them occasionally as a backup.
You're correct. I enter a lot of information (just typed texts, no graphics, charts, photos, etc.) regarding interactions with contacts in the note field. The problem is new, though. It started after the HIGH SIERRA update. I have an external hard drive and after my visit to the Apple Store, the "in my mac" entry was removed by the "genius" and now I only enter info under the "iCloud" label, so I would think that everything is backed up, but I'll ascertain it at the genius bar. Thank you for the reply and the suggestion made.
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Does the problem depend on certain types of data? I just created a 300+ line note and it scrolls and edits just fine.
DS
The problem started after the High Sierra update. It may be a coincidence. Trying to find solutions for the problem, I just found out that iCloud sets storage limits for Calendar, Contacts, Reminders and Bookmarks:
https://support.apple.com/en-us/HT202158 -- After three visits to the Genius Bar, no one mentioned that storage limit could be cause of the issue I'm experiencing, but I'll investigate it further. The problem is erratic, sometimes can't be duplicated with cards that had malfunctioned before, and it happens with long and short texts. I've 1,142 cards (50,000 are allowed.) The jumping cursor that can only stabilize if I use the arrows to move the around is another big issue. Thank you, dsemf!