I have. [MyL5] Australia/New Zealand - #86 by irvinewade
Guess. NB: Guess /home/purism/.local/share/evolution/addressbook/system/contacts.db
That appears to be an SQLite database so I suggest researching on the internet how to back up such a database.
The one approach that I would not take is just to copy (cp) the file - because I can see that the file is ‘open’ (lsof) - but maybe it is not opened at boot and so maybe would be safe to copy in that situation.
My backup strategy (still to be written and tested 
) will be to back up the entire eMMC drive to another computer (using Jumpdrive). So that will pick up this database and everything else.
This question confuses me. When I go into the Contacts app and look at a contact, below the person’s initials and name, I see a list with entries of the format
contact-type contact-number sms-icon phone-icon
one per line, where contact-type is e.g. ‘mobile’ or ‘work’. (Then the Note field is displayed below that.)
For example: Mobile 0424242420 sms-icon phone-icon
Clicking the phone-icon causes it to start a call to that number (contact-number), which is the behaviour that I would expect. (Clicking the sms-icon starts Chatty in order to send a text message to that number.)
The layout could definitely be improved but it does at least basically work.
(A lot of the contact types did not import correctly e.g. show up as ‘other’ but in fixing that, I don’t have to enter the phone number, just change the contact type from ‘other’ to e.g. ‘home’. This may have been a problem in the original data.)