Apps: Notes Memos
This is the worst scenario possible because there is not an standard for this purpose and every app is using the format they like.
Note that the standard iCalendar support entries of text (VJOURNAL) that is supposed to have an associated date, but having null as date it could be consider just a note. Vjournal entries without date could be treated as notes, and it will allow to sync with CalDAV servers. Unfortunately and AFAIK at the moment there is no apps exporting notes to ical/.ics (vjournal)
Support sync between Android app and Addon for Firefox Addon for Firefox is a webextension, so it is not compatible with legacy extensions a it will not work in old ver of FF or Palemoon. Sync: It requires an account in Firefox server
Addon saves data in JSON file storage.js stored at specific folder .\ejm_ff_profile\browser-extension-data\notes@mozilla.com
There is a Restore function, it reads from a specific folder
paste/save modified file (omni-notes) to device .\android\Omni Notes Foss
Restore backup
There is a backup function, it saves in a specific folder .\android\Omni Notes Foss\
There are import functions for several format (Palm,Outlook,AK notepad, OI notepad...) However import from Noteeverything requires the PRO addon, which doesn't work on all devices. Using Mybackup (rerware) with previous backup https://play.google.com/store/apps/details?id=com.rerware.android.MyBackup&hl=es
So as workaround¿not working anymore???
paste/save modified file (backup.tmp /¿¿¿¿notes.db???) to device ./android/noteeverything/backup
Install "Note everything" apk (¿¿¿version 4.2.4???) , app will detect previous backup in the folder and will ask for a restore
There is not function for this, but there is a backup in: ./android/noteeverything/backup Using Mybackup (rerware)