How do I sync my data (and use it)

Mainly I have this data:

• Working projects, out of sync. It’s very critical to avoid data loss. I use Borg for daily backup.
• Wiki library, synced by Resilio Sync, two-way (data storage ↔ phone and tablet). To avoid data loss, I am using Git and backup system using Borg. Additionally, my sync server usually online, to avoid sync conflicts. Ignored directories: .obsidian, .git. I also place here additional data:
  • Current reading fiction books
  • Current reading technical books, research papers and other documents with notes
  • My art
  • Saved articles
• Music, synced two-way. I use it mostly to listen music offline.
• Photos from tablet and phone, synced one way (phone and tablet → data storage), to avoid data loss. I import them into library using darktable and then delete from phone and tablet manually after processing.
• Videos are manged by samba server.

Check also maintenance.