Backup the file
data/datastore.php (by FTP or SSH). Restore by putting the file back in place.
rsync -avzP my.server.com:/var/www/shaarli/data/datastore.php datastore-$(date +%Y-%m-%d_%H%M).php
To export links as an HTML file, under Tools > Export, choose:
Restore by using the
./export-bookmarks.py --url=https://my.server.com/shaarli --username=myusername --password=mysupersecretpassword --download-dir=./ --type=all
If you export your bookmark from Diigo, make sure you use the Delicious export, not the Netscape export. (Their Netscape export is broken, and they don't seem to be interested in fixing it.)
See this issue for import tweaks.
To correctly import the tags from a SemanticScuttle HTML export, edit the HTML file before importing and replace all occurences of
tags= (lowercase) to
Shaarli cannot import data directly from Scuttle. However, you can use this third party tool: https://github.com/q2apro/scuttle-to-shaarli to export the Scuttle database to the Netscape HTML format compatible with the Shaarli importer.
Prepend note permalinks with this Shaarli instance's URL (useful to import bookmarks in a web browser)
Bookmarks menu > Show all bookmarksor
Import and Backup > Import bookmarks in HTML format
Your bookmarks will be imported in Firefox, ready to use, with tags and descriptions retained. "Self" (notes) shaares will still point to the Shaarli instance you exported them from, but the note text can be viewed directly in the bookmark properties inside your browser. Depending on the number of bookmarks, the import can take some time.
You may be interested in these Firefox addons to manage links imported from Shaarli